Add warning message if calibration object not found

Author: romainschotter

PWGLF/TableProducer/Strangeness/strangenesstofpid.cxx

@@ -736,6 +736,8 @@ struct strangenesstofpid {
             if (!hSigmaPosOmPi || !hSigmaPosOmPr || !hSigmaNegOmPi || !hSigmaNegOmPr || !hSigmaBachOmKa)
               LOG(info) << "Problems finding omega sigma histograms!";
           }
+        } else {
+            LOG(warn) << "Problems finding calibration objects for run " << runNumber << " at " << ccdbConfigurations.nSigmaPath << ". Proceed without it";
         }
       }
     }