code cleanup

src/main/java/fr/pasteur/ida/zellige/gui/controller/PreprocessingController.java

@@ -194,14 +194,15 @@ public class PreprocessingController< T extends RealType< T > & NativeType< T >
 
     /**
      * Finds and sets the input color tables.
+     *
      * @param index the position of the input in the list of displayed datasets
      */
-    public void setColorTable( int index)
+    public void setColorTable( int index )
     {
         ImageDisplayService imageDisplayService = parentController.getMainAppFrame().getImage();
-        DatasetView datasetView = ( DatasetView ) imageDisplayService.getImageDisplays().get(index).get( 0 );
-        ArrayList<ColorTable> colorTables = new ArrayList<>(datasetView.getColorTables());
-        getModel().getColors().set( colorTables  );
+        DatasetView datasetView = ( DatasetView ) imageDisplayService.getImageDisplays().get( index ).get( 0 );
+        ArrayList< ColorTable > colorTables = new ArrayList<>( datasetView.getColorTables() );
+        getModel().getColors().set( colorTables );
     }
 
 
@@ -252,7 +253,14 @@ public class PreprocessingController< T extends RealType< T > & NativeType< T >
             getModel().getChannel().set( channelValue.getValue() - 1 );
         }
         // Set the input channel
-        getModel().getInput_channel().set( Views.hyperSlice( getModel().getInput().get(), 2, getModel().getChannel().get() ) );
+        if ( getModel().getInput().get() == null )
+        {
+            showError( new NoInputException() );
+        }
+        else
+        {
+            getModel().getInput_channel().set( Views.hyperSlice( getModel().getInput().get(), 2, getModel().getChannel().get() ) );
+        }
     }
 
     private void disableParameters()
@@ -289,7 +297,7 @@ public class PreprocessingController< T extends RealType< T > & NativeType< T >
 
     public void setParameters( ZelligeParameters parameters )
     {
-       binValue.getValueFactory().setValue(parameters.getPretreatmentParameters().getBin());
-       channelValue.getValueFactory().setValue(parameters.getPretreatmentParameters().getChannel());
+        binValue.getValueFactory().setValue( parameters.getPretreatmentParameters().getBin() );
+        channelValue.getValueFactory().setValue( parameters.getPretreatmentParameters().getChannel() );
     }
 }
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