Needed fixes to run with photos

[alebihan]

PR description:

Two protections added to avoid crashed when using photos ("null vertices of intermediate 746 particles")

PR validation:

Tested on 10k events with cmsDriver.py Configuration/GenProduction/python/SMP-RunIII2024Summer24wmLHEGS-00182-fragment.py --eventcontent RAWSIM,LHE --customise Configuration/DataProcessing/Utils.addMonitoring --datatier GEN-SIM,LHE --conditions 140X_mcRun3_2024_realistic_v26 --beamspot DBrealistic...

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

This PR is made to the master branch to be backported to 140X releases to produce a 2024 sample for the dedicated DY production needed for tau polarisation studies

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Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49294

• There are other open Pull requests which might conflict with changes you have proposed:
  • File GeneratorInterface/Core/src/EmbeddingHepMCFilter.cc modified in PR(s): Embedding hep mc filter fix for photos #50894

Code check has found code style and quality issues which could be resolved by applying following patch(s)

• code-checks:
  https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49294/code-checks.patch
  e.g. curl -k https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49294/code-checks.patch | patch -p1
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• code-format:
  https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49294/code-format.patch
  e.g. curl -k https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49294/code-format.patch | patch -p1
  You can also run scram build code-format to apply code format directly

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50915/49296

• There are other open Pull requests which might conflict with changes you have proposed:
  • File GeneratorInterface/Core/src/EmbeddingHepMCFilter.cc modified in PR(s): Embedding hep mc filter fix for photos #50894

[cmsbuild]

A new Pull Request was created by @alebihan for master.

It involves the following packages:

• GeneratorInterface/Core (generators)

@cmsbuild, @lviliani, @mkirsano, @sensrcn, @theofil can you please review it and eventually sign? Thanks.
@alberto-sanchez, @mkirsano this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

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