fix: Loop internal node error did not terminate workflow (#4520)

Author: shaohuzhang1

apps/application/flow/workflow_manage.py

@@ -471,6 +471,8 @@ def hand_event_node_result(self, current_node, node_result_future):
                     current_node.node_chunk.add_chunk(chunk)
                 else:
                     list(result)
+            if current_node.status == 500:
+                return None
             return current_result
         except Exception as e:
             # 添加节点