Added tryToGet method to EventSetup and EventSetupRecord

[Dr15Jones]

Added the method tryToGet to EventSetup and EventSetupRecord to allow attempting to get a Record without having an exception happen if it fails. Instead of an exception, a null pointer is returned.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_7_2_X.

Added tryToGet method to EventSetup and EventSetupRecord

It involves the following packages:

FWCore/Framework

@cmsbuild, @Degano, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
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[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes or unless it breaks tests.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4042/28/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes (tests are also fine).