Move check for dataSource or binding into NSOutlineView before calling method to draw the row per discussion with @fredkiefer

Source/GSThemeDrawing.m

@@ -3534,15 +3534,6 @@ static NSDictionary *titleTextAttributes[3] = {nil, nil, nil};
   NSInteger i;
   id dataSource = [outlineView dataSource];
   NSTableColumn *outlineTableColumn = [outlineView outlineTableColumn];
-  GSKeyValueBinding *theBinding = nil;
-
-  theBinding = [GSKeyValueBinding getBinding: NSContentBinding 
-				   forObject: outlineView];
-  
-  if (dataSource == nil && theBinding == nil)
-    {
-      return;
-    }
 
   /* Using columnAtPoint: here would make it called twice per row per drawn
      rect - so we avoid it and do it natively */

Source/NSOutlineView.m

@@ -1032,6 +1032,16 @@ static NSImage *unexpandable  = nil;
  */
 - (void) drawRow: (NSInteger)rowIndex clipRect: (NSRect)aRect
 {
+  GSKeyValueBinding *theBinding = nil;
+
+  theBinding = [GSKeyValueBinding getBinding: NSContentBinding 
+				   forObject: self];
+  
+  if (_dataSource == nil && theBinding == nil)
+    {
+      return;
+    }
+  
   if (_viewBased)
     {
       [self _drawCellViewRow: rowIndex