Add explicit initialization check to pythia8 interface (73x)

[bendavid]

Previously failure in pythia8 initialization caused empty events to be produced and silently filtered out by the generator sequence, making the problem not obvious in central production. This will now cause the job to crash as it should in this case.

[cmsbuild]

A new Pull Request was created by @bendavid (Josh Bendavid) for CMSSW_7_3_X.

Add explicit initialization check to pythia8 interface (73x)

It involves the following packages:

GeneratorInterface/Core
GeneratorInterface/Pythia8Interface

@vciulli, @covarell, @thuer, @cmsbuild, @nclopezo, @bendavid can you please review it and eventually sign? Thanks.
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@nclopezo you are the release manager for this.
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[bendavid]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_3_X IBs unless changes or unless it breaks tests.

[cmsbuild]

+1
Tested at: 4872c3f
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6455/946/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_3_X IBs unless changes (tests are also fine). This pull request will be automatically merged.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6455/946/summary.html