PMGTruthWeightTool: fix support when no systematics are present
PMGTruthWeightTool: fix support when no systematics are present.
It seems that I missed a corner case when testing so the systematics map was not filled in this case.
PMGTruthWeightTool: fix support when no systematics are present.
It seems that I missed a corner case when testing so the systematics map was not filled in this case.