fix: get first page of sticker packs (#404)

Author: Kiruha01

pybotx/client/stickers_api/get_sticker_packs.py

@@ -2,6 +2,7 @@
 from uuid import UUID
 
 from pybotx.client.authorized_botx_method import AuthorizedBotXMethod
+from pybotx.missing import Undefined
 from pybotx.models.api_base import UnverifiedPayloadBaseModel, VerifiedPayloadBaseModel
 from pybotx.models.stickers import StickerPackFromList, StickerPackPage
 
@@ -18,7 +19,7 @@ def from_domain(
         limit: int,
         after: Optional[str],
     ) -> "BotXAPIGetStickerPacksRequestPayload":
-        return cls(user_huid=huid, limit=limit, after=after)
+        return cls(user_huid=huid, limit=limit, after=after if after else Undefined)
 
 
 class BotXAPIGetPaginationResult(VerifiedPayloadBaseModel):

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pybotx"
-version = "0.55.7"
+version = "0.55.8"
 description = "A python library for interacting with eXpress BotX API"
 authors = [
     "Sidnev Nikolay <nsidnev@ccsteam.ru>",