message: add graceful check for cut object in Ds addtask
diff: @@ -27,9 +27,9 @@ AliAnalysisTaskSEDs *AddTaskDs(Int_t system=0/*0=pp,1=PbPb*/,
  } else {
  filecuts=TFile::Open(filename.Data());
  if(!filecuts ||(filecuts&& !filecuts->IsOpen())){
  - ::Fatal("AddTaskDs", "Cut object not found: analysis will not start!\n");
  + ::Fatal("AddTaskDs", "Cut file not found on Grid: analysis will not start!\n");
  }
  - else printf("Cut object correctly found\n");
  + else printf("Cut file correctly found\n");
  }
  //Analysis Task
  @@ -43,7 +43,12 @@ AliAnalysisTaskSEDs *AddTaskDs(Int_t system=0/*0=pp,1=PbPb*/,
  }
  else ::Fatal("AddTaskDs", "Standard cut object not available for PbPb: analysis will not start!\n");
  }
  - else analysiscuts = (AliRDHFCutsDstoKKpi*)filecuts->Get("AnalysisCuts");
  + else {analysiscuts = (AliRDHFCutsDstoKKpi*)filecuts->Get("AnalysisCuts");
  + if (!analysiscuts)
  + { ::Fatal("AddTaskDs", "Cut object named \"AnalysisCuts\" not found in cutfile.");
  + return NULL;
  + }
  +}
  AliAnalysisTaskSEDs *dsTask = new AliAnalysisTaskSEDs("DsAnalysis",analysiscuts,storeNtuple);
  