cms-sw/cmssw — pull request #6458 by bendavid (2014-11-18 00:50:58+00:00)
Title: Backport of powheg emission veto, plus explict initialization check for Pythia8 (71x)

Backports from 73x of
https://github.com/cms-sw/cmssw/pull/6009
https://github.com/cms-sw/cmssw/pull/6455