Autocomplete fails with stack trace when clearing and pressing enter after submit

The autocomplete component fails with stack trace when the input is cleared and submitted when a value has been selected previously. See attached code (Wicket 6.6.0, Wiquery 6.6.0). Could not attach a quickstart.

Steps to reproduce:
1. Navigate to the page with the autocomplete
2. Type 'One'. The autocomplete appears
3. Select the entry
4. Press 'submit'
5. Clear the input and press enter  -> stack trace

``` java
public class HomePage extends WebPage {
    private final List<TestObject> choices = Arrays.asList(new TestObject("One"), new TestObject("Two"), new TestObject("Three"));

    public HomePage() {
        Form<?> form = new Form<Void>("form");
        add(form);
        form.add(new AutocompleteComponent<TestObject>("autocomplete", new Model<TestObject>(), Model.ofList(choices), new ChoiceRenderer<TestObject>("value")) {
            @Override
            public TestObject getValueOnSearchFail(String input) {
                return new TestObject(input);
            }
        });
    }

    public static class TestObject implements Serializable {
        private String value;
        public TestObject(String value) {
            this.value = value;
        }
        public String getValue() {
            return value;
        }
    }
}
```

``` html
<!DOCTYPE html>
<html xmlns:wicket="http://wicket.apache.org">
    <body>
        <form wicket:id="form">
            <span wicket:id="autocomplete"></span>

            <button type="submit">
                Submit
            </button>
        </form>
    </body>
</html>
```

The stack trace

```
java.lang.NullPointerException
     at org.odlabs.wiquery.ui.autocomplete.AbstractAutocompleteComponent.convertInput(AbstractAutocompleteComponent.java:306)
     at org.apache.wicket.markup.html.form.FormComponent.validate(FormComponent.java:1137)
     at org.apache.wicket.markup.html.form.Form$16.validate(Form.java:1851)
     at org.apache.wicket.markup.html.form.Form$ValidationVisitor.component(Form.java:173)
     at org.apache.wicket.markup.html.form.Form$ValidationVisitor.component(Form.java:157)
     at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:274)
     at org.apache.wicket.util.visit.Visits.visitPostOrderHelper(Visits.java:262)
     at org.apache.wicket.util.visit.Visits.visitPostOrder(Visits.java:245)
     at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrder(FormComponent.java:389)
     at org.apache.wicket.markup.html.form.Form.visitFormComponentsPostOrder(Form.java:1089)
     at org.apache.wicket.markup.html.form.Form.validateComponents(Form.java:1843)
     at org.apache.wicket.markup.html.form.Form.validate(Form.java:1808)
     at org.apache.wicket.markup.html.form.Form.process(Form.java:890)
     at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:767)
     at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:700)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
     at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:240)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:226)
     at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:840)
     at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:254)
     at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:211)
     at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:282)
     at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:244)
     at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
     at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:267)
     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1332)
     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:477)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
     at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
     at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1031)
     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)
     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)
     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:965)
     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
     at org.eclipse.jetty.server.Server.handle(Server.java:348)
     at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:452)
     at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:47)
     at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:894)
     at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:948)
     at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:851)
     at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
     at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:66)
     at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:254)
     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
     at java.lang.Thread.run(Thread.java:662)

Complete stack:

org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at [Form [Component id = form]] on component [Form [Component id = form]] threw an exception
     at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268)
     at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:240)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:226)
     at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:840)
     at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:254)
     at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:211)
     at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:282)
     at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:244)

java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
     at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:240)
     at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:226)
     at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:840)
     at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
     at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:254)
     at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:211)
     at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:282)
     at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:244)
```


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