If IS_CHANGED returns exception delete the output instead of crashing.

execution.py

@@ -97,21 +97,25 @@ def recursive_output_delete_if_changed(prompt, old_prompt, outputs, current_item
 
     is_changed_old = ''
     is_changed = ''
+    to_delete = False
     if hasattr(class_def, 'IS_CHANGED'):
         if unique_id in old_prompt and 'is_changed' in old_prompt[unique_id]:
             is_changed_old = old_prompt[unique_id]['is_changed']
         if 'is_changed' not in prompt[unique_id]:
             input_data_all = get_input_data(inputs, class_def, unique_id, outputs)
             if input_data_all is not None:
+                try:
                     is_changed = class_def.IS_CHANGED(**input_data_all)
                     prompt[unique_id]['is_changed'] = is_changed
+                except:
+                    to_delete = True
         else:
             is_changed = prompt[unique_id]['is_changed']
 
     if unique_id not in outputs:
         return True
 
-    to_delete = False
+    if not to_delete:
         if is_changed != is_changed_old:
             to_delete = True
         elif unique_id not in old_prompt: