DQMStore::removeElement: do not remove non-existing MEs (75x)

[fwyzard]

The previous logic would not prevent calling

    data_.erase(data_.end())

when the requested MonitorElement does not exist, and warning is false.

[fwyzard]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for CMSSW_7_5_X.

DQMStore::removeElement: do not remove non-existing MEs (75x)

It involves the following packages:

DQMServices/Core

@cmsbuild, @danduggan, @deguio can you please review it and eventually sign? Thanks.
@barvic this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[cmsbuild]

+1
Tested at: c85b9c9
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11049/7760/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11049/7760/summary.html

[deguio]

+1
thanks @fwyzard

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar