cms-sw/cmssw — pull request #2486 by wmtan (2014-02-16 03:16:34+00:00)
Title: Add default ctors

Work around a ROOT limitation that is causing fatal errors in relvals in the ROOT6 branch.
A JIRA ticket has been opened against ROOT for the problem, but in the meantime we can avoid the errors by simply adding otherwise unnecessary public default constructors to two classes that do not have them.