make variables access robuster (#3406)

### What problem does this PR solve?


### Type of change

- [x] Performance Improvement

agent/component/base.py

@@ -399,7 +399,7 @@ class ComponentBase(ABC):
         self._param.check()
 
     def get_dependent_components(self):
-        cpnts = [para["component_id"] for para in self._param.query if para["component_id"].lower().find("answer") < 0]
+        cpnts = [para["component_id"] for para in self._param.query if para.get("component_id") and para["component_id"].lower().find("answer") < 0]
         return cpnts
 
     def run(self, history, **kwargs):

agent/component/generate.py

@@ -63,7 +63,7 @@ class Generate(ComponentBase):
     component_name = "Generate"
 
     def get_dependent_components(self):
-        cpnts = [para["component_id"] for para in self._param.parameters if para["component_id"].lower().find("answer") < 0]
+        cpnts = [para["component_id"] for para in self._param.parameters if para.get("component_id") and para["component_id"].lower().find("answer") < 0]
         return cpnts
 
     def set_cite(self, retrieval_res, answer):