Fixed null pointer conversion error for newer versions of ROOT #293
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As mentioned in this issue, a conversion error is thrown when running the postprocessor with newer versions of ROOT. In particular, it is complaining about the TEntryList being supplied to the constructor. I believe this is because
entrylistis NoneType by default, rather than a null pointer. By replacing this default value withROOT.MakeNullPointer(ROOT.TEntryList), theTTreeReaderconstructor instead receives a nullpointer as it expects. I tested this simple fix using CMSSW v12.1.0 (pre, with ROOT v6.24) and CMSSW v10.6.25. I used a custom module and skimmed some custom MC signal samples for the test.