AlignmentTrackChi2: Making sure track fit is checked, before getting the chisq

src/modules/AlignmentTrackChi2/AlignmentTrackChi2.cpp

@@ -150,8 +150,15 @@ void AlignmentTrackChi2::MinimiseTrackChi2(Int_t&, Double_t*, Double_t& result,
             fitIterations = 0;
         }
 
-        // Add the new chi2
-        return track->getChi2();
+        // check if the fit has failed
+        if(!track->isFitted()) {
+            LOG(WARNING) << "Refit failed - track will be discarded for this alignment step ";
+            return 0.0;
+        }
+        else {
+            // add the new chi2
+            return track->getChi2();
+        }
     };
 
     // Loop over all tracks