Fix for jet flavor lepton selection and possible out of range exception: Backport from 7_2_X to 5_3_X

[ferencek]

Backport of #4482

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_5_3_X.

Fix for jet flavor lepton selection and possible out of range exception: Backport from 7_2_X to 5_3_X

It involves the following packages:

PhysicsTools/JetMCAlgos

@nclopezo, @vadler, @cmsbuild, @Degano, @monttj can you please review it and eventually sign? Thanks.
@pvmulder this is something you requested to watch as well.
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@smuzaffar you are the release manager for this.
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[smuzaffar]

+tested

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_5_3_X IBs unless changes (tests are also fine). @smuzaffar can you please take care of it?