Small bug fix in HLT-btag validation code

[silviodonato]

In the previous code the efficiency error could have a division by zero.
It has been fixed using err=0 when d is 0.

[cmsbuild]

A new Pull Request was created by @silviodonato for CMSSW_7_4_X.

Small bug fix in HLT-btag validation code

It involves the following packages:

HLTriggerOffline/Btag

@cmsbuild, @danduggan, @nclopezo, @deguio can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @ferencek, @acaudron, @pvmulder, @imarches this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.

[cmsbuild]

+1
Tested at: 40ee261
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7213/1938/summary.html

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_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-7213/1938/summary.html