Deleting Score Features gives an error

[mkabra]

When an old score file being used as perframe feature is removed by the user, it gives an error.

Error using JLabelData/deleteSingleScoreFeature (line 1031) Assertion failed.

Error in JLabelData/setScoreFeatures (line 1087) obj.deleteSingleScoreFeature(scoreFeaturesDeleted(i));

Error in JLabel>changeScoreFeaturesDone (line 8558) data.setScoreFeatures(scoreFeaturesFileNameListNew, ...

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in JLabel (line 37) gui_mainfcn(gui_State, varargin{:});

Error in ChangeScoreFeaturesDialog/doneButtonPressed (line 258) JLabel('changeScoreFeaturesDone', ...

Error in ChangeScoreFeaturesDialog>@(g,e)(self.doneButtonPressed()) (line 152) 'callback',@(g,e)(self.doneButtonPressed()));

Error while evaluating uicontrol Callback

Need to fix this.