Remove useless condition

theano/gof/toolbox.py

@@ -448,9 +448,6 @@ class NoOutputFromInplace(Feature):
         if not hasattr(fgraph, 'destroyers'):
             return True
 
-        if self.last_idx is None:
-            outputs_to_validate = list(fgraph.outputs)[self.first_idx:]
-        else:
         outputs_to_validate = list(fgraph.outputs)[self.first_idx:
                                                    self.last_idx]