Fix crash when running StMuDst2StEventMaker with partial MuDst (#747)

When running afterburner MuDst->PicoDst conversion for FWD we run into
this error due to Fms and RHICf Utils crashing when mInfo exists but has
no entries. This fixes that issue

---------

Co-authored-by: Akio Ogawa <[email protected]>
Co-authored-by: [email protected] <[email protected]>
Co-authored-by: Dmitri Smirnov <[email protected]>

Author: 4 people

StRoot/StMuDSTMaker/COMMON/StMuFmsCollection.cxx

@@ -141,14 +141,18 @@ StMuFmsPoint* StMuFmsCollection::getPoint(int index) {
 }
 
 StMuFmsInfo* StMuFmsCollection::getInfo() {
-  if (!mInfo) return NULL;
-  return static_cast<StMuFmsInfo*>(mInfo->At(0));
+  if (!mInfo) return nullptr;  
+  if (mInfo->GetEntriesFast()>0) return static_cast<StMuFmsInfo*>(mInfo->At(0));
+  return nullptr;
 }
 
-
 Int_t StMuFmsCollection::fmsReconstructionFlag() {
-  return getInfo()->fmsReconstructionFlag();
+  StMuFmsInfo* info=getInfo();
+  if(info) return info->fmsReconstructionFlag();
+  return 0;
 }
+
 void StMuFmsCollection::setFmsReconstructionFlag(Int_t v){ 
-  getInfo()->setFmsReconstructionFlag(v);
-}
+  StMuFmsInfo* info=getInfo();
+  if(info) info->setFmsReconstructionFlag(v);
+}

StRoot/StMuDSTMaker/COMMON/StMuRHICfUtil.cxx

@@ -59,7 +59,7 @@ void StMuRHICfUtil::fillMuRHICf(StMuRHICfCollection* muColl, StRHICfCollection*
   muRHICfRawHit -> setTriggerNumber(coll->getTriggerNumber());
   muRHICfRawHit -> setRunTime(0, coll->getRunTime(0));
   muRHICfRawHit -> setRunTime(1, coll->getRunTime(1));
-  muRHICfRawHit -> setRunTRGM(coll->getRunTRGM());
+  muRHICfRawHit -> setRunTRGM(coll->getRunTRGM());  
 
   fillMuRHICfRawHit(muRHICfRawHit, rhicfRawHit);
 
@@ -87,6 +87,9 @@ void StMuRHICfUtil::fillRHICf(StRHICfCollection* coll, StMuRHICfCollection* muCo
   StMuRHICfRawHit* muRHICfRawHit = muColl -> getRawHit();
   StRHICfRawHit* rhicfRawHit = coll -> rawHitCollection();
 
+  if(!muRHICfRawHit) return;
+  if(!rhicfRawHit) return;
+
   coll -> setRHICfRunNumber(muRHICfRawHit->getRHICfRunNumber());
   coll -> setRHICfEventNumber(muRHICfRawHit->getRHICfEventNumber());
   coll -> setRunType(muRHICfRawHit->getRunType());