Add missing call to SignalRepeatedHadronization::Clear
Using the SignalRepeatedHadronization generation tool currently results in many warnings of the form
Generation.Sign...WARNING Event does not have exactly two beam particles
when a signal particle has already been generated. This seems to originate from a missing call to SignalRepeatedhadronization::Clear before the call to m_productionTool->hadronize(...)at line 251 of SignalRepeatedHadronization.cpp.