Merge pull request #335 from IBM/development_maintenance

Remove unnecessary pass

Author: beat-buesser

art/attacks/evasion/pixel_threshold.py

@@ -236,7 +236,6 @@ def callback_fn(x, convergence=None):
             except Exception as exception:
                 if self.verbose:
                     print(exception)
-                pass
 
             adv_x = strategy.result[0]