Add back a comment that I accidentally removed

HLTrigger/Egamma/plugins/HLTEgammaCombMassFilter.cc

@@ -118,6 +118,7 @@ void HLTEgammaCombMassFilter::getP4OfLegCands(const edm::Event& iEvent,
       p4s.push_back(phoCand->p4());
     }
   } else if (!clusCands.empty()) {
+    //try trigger cluster (should never be this, at the time of writing (17/1/11) this would indicate an error)
     for (auto& clusCand : clusCands) {
       p4s.push_back(clusCand->p4());
     }