some more minor bug fixing leading towards ADDRUN

src/classes/PRunSingleHisto.cpp

@@ -379,7 +379,7 @@ bool PRunSingleHisto::PrepareData()
       // get T0's of the to be added run
       int t0Add;
       // check if the t0's are given in the msr-file
-      if (fRunInfo->fT0[i] == -1) { // t0's are NOT in the msr-file
+      if (i >= fRunInfo->fT0.size()) { // t0's are NOT in the msr-file
         // check if the t0's are in the data file
         if (addRunData->fT0s.size() != 0) { // t0's in the run data
           // keep the proper t0's. For single histo runs, forward is holding the histo no