Give warning for non-existent track when using change label. Fix ProcessNewBorns bug

src/MATLAB/+Editor/ContextChangeLabel.m

@@ -33,6 +33,11 @@ function ContextChangeLabel(time,trackID)
     if(isempty(newTrackID)),return,end;
     newTrackID = str2double(newTrackID(1));
 
+    if(isempty(CellTracks(newTrackID).hulls))
+        warn = sprintf('Track %d does not exist, cannot change',newTrackID);
+        warndlg(warn);
+        return
+    end
     curHull = CellTracks(newTrackID).hulls(1);
 
     bErr = Editor.ReplayableEditAction(@Editor.ChangeLabelAction, trackID,newTrackID,time);

src/MATLAB/+Families/ProcessNewborns.m

@@ -50,7 +50,7 @@ Tracker.PatchMatchedTracks();
 deadHulls = CellPhenotypes.hullPhenoSet(1,(CellPhenotypes.hullPhenoSet(2,:) == 1));
 deadTracks = unique(Hulls.GetTrackID(deadHulls));
 for i=1:length(deadTracks)
-    Tracks.StraightenTrack(deadTracks);
+    Tracks.StraightenTrack(deadTracks(i));
 end
 
 % %Remove any newly created parasite tracks from tree