Re-enabling LogWarning in HadronAndPartonSelector (76X)

[ferencek]

Backport of #12435.

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_7_6_X.

It involves the following packages:

PhysicsTools/JetMCAlgos

@cmsbuild, @vadler, @davidlange6, @monttj can you please review it and eventually sign? Thanks.
@ferencek, @acaudron, @pvmulder, @imarches this is something you requested to watch as well.
@Degano you are the release manager for this.

Following commands in first line of a comment are recognized

• +1|approve[d]|sign[ed]: L1/L2's to approve it
• -1|reject[ed]: L1/L2's to reject it
• assign <category>[,<category>[,...]]: L1/L2's to request signatures from other categories
• unassign <category>[,<category>[,...]]: L1/L2's to remove signatures from other categories
• hold: L1/all L2's/release manager to mark it as on hold
• unhold: L1/user who put this PR on hold
• merge: L1/release managers to merge this request
• [@cmsbuild,] please test: L1/L2 and selected users to start jenkins tests
• [@cmsbuild,] please test with cms-sw/cmsdist#<PR>: L1/L2 and selected users to start jenkins tests using externals from cmsdist

[slava77]

@cmsbuild please test
to see if this is not noisy

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/10091/console

[cmsbuild]

+1
Tested at: 743eaba
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12436/10091/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12436/10091/summary.html

[ferencek]

@davidlange6, just checking if there was a specific reason not to merge this one. Its 80X equivalent was successfully merged several weeks ago. Thanks