correct pep8 rules

src/View/D90AdisTS/Window.py

@@ -267,12 +267,12 @@ class D90AdisTSWindow(PamhyrWindow):
         undo_stack = self._undo_stack
         if undo_stack is None or not undo_stack.canUndo():
             return
-        
+
         if isinstance(undo_stack.command(undo_stack.index() - 1), SetCommand):
             self._table.undo()
         else:
             self._table_spec.undo()
-            
+
         self._update()
 
     def _redo(self):