Fix unreachable code in loop.py and iteration.py

Co-authored-by: JinHai-CN <33142505+JinHai-CN@users.noreply.github.com>

agent/component/iteration.py

@@ -57,9 +57,7 @@ class Iteration(ComponentBase, ABC):
                 return cid
 
     def _invoke(self, **kwargs):
-        if self.check_if_canceled("Iteration processing"):
-            return
-
+        if not self.check_if_canceled("Iteration processing"):
             arr = self._canvas.get_variable_value(self._param.items_ref)
             if not isinstance(arr, list):
                 self.set_output("_ERROR", self._param.items_ref + " must be an array, but its type is "+str(type(arr)))

agent/component/loop.py

@@ -51,9 +51,7 @@ class Loop(ComponentBase, ABC):
                 return cid
 
     def _invoke(self, **kwargs):
-        if self.check_if_canceled("Loop processing"):
-            return
-
+        if not self.check_if_canceled("Loop processing"):
             for item in self._param.loop_variables:
                 if any([not item.get("variable"), not item.get("input_mode"), not item.get("value"),not item.get("type")]):
                     assert "Loop Variable is not complete."