check for null (#1046)

Author: baltzell

reconstruction/dc/src/main/java/org/jlab/rec/dc/track/TrackCandListFinder.java

@@ -1102,6 +1102,7 @@ private List<Track> findCurvedTracks(CrossList crossList, DCGeant4Factory DcDete
                                         trjFind, fitStateVec,
                                         fitStateVec.getZ(),
                                         DcDetector, dcSwim);
+                                
                                 // add candidate to list of tracks
                                 if (cand.fit_Successful = true) {
                                     cands.add(cand);