DerivationFrameworkMCTruth: Retrieve EventInfo instead of McEventInfo
Implementing a bugfix that was suggested in a PATHelp discussion here.
The EventInfo object isn't retrieved so that the mcChannelNumber is set to 0. This causes a runtime warning in the PMGTruthWeightTool, which expects a non-zero mcChannelNumber:
PMGTruthWeightTool WARNING MC channel number in TruthMetaData is invalid - assuming that channel 0 has the correct information.