Don't print traceback when processing interrupted.

execution.py

@@ -194,6 +194,9 @@ class PromptExecutor:
                             if valid:
                                 recursive_execute(self.server, prompt, self.outputs, x, extra_data, executed)
             except Exception as e:
+                if isinstance(e, comfy.model_management.InterruptProcessingException):
+                    print("Processing interrupted")
+                else:
                     print(traceback.format_exc())
                 to_delete = []
                 for o in self.outputs: