add extra initialization checks for VirtualJetProducer with empty inputs

[slava77]

add extra initialization checks for short-cirquited cases with no inputs (effects not accounted in PR 11902 and 11820 in 76X)

Solves the HI job failures reported in
https://hypernews.cern.ch/HyperNews/CMS/get/recoDevelopment/1419.html

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_8_0_X.

It involves the following packages:

RecoJets/JetProducers

@cmsbuild, @cvuosalo, @davidlange6, @slava77 can you please review it and eventually sign? Thanks.
@rappoccio, @jdolen, @ahinzmann, @TaiSakuma, @yslai, @nhanvtran, @schoef, @mariadalfonso this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10897/console

[cmsbuild]

+1
Tested at: 54d9ed9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10897/summary.html

[slava77]

@cmsbuild please test
jenkins got stuck in file copy step

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10909/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10923/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10924/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10930/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10931/console

[cmsbuild]

+1
Tested at: 54d9ed9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10909/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10909/summary.html

[slava77]

+1

for #13152 54d9ed9

• changes affect only the logical branch that would otherwise crash
• jenkins tests pass and comparisons show no differences
• crash "status 139" reported in https://hypernews.cern.ch/HyperNews/CMS/get/recoDevelopment/1419.html is gone based on tests CMSSW_8_0_0_pre5 done with the PR topic branch (before the PR submission)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1

[cmsbuild]

There was an issue with git-cms-merge-topic you can see the log here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10924/git-merge-result

[cmsbuild]

+1
Tested at: 54d9ed9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10923/summary.html

[cmsbuild]

+1
Tested at: 54d9ed9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10930/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13152/10930/summary.html