Fix Pylance reportOptionalMemberAccess in _handle_function_call_cancel

Extract dictionary value to local variable and check for None before
accessing cancel_on_interruption attribute, since the dictionary values
are typed as Optional[FunctionCallInProgressFrame].

src/pipecat/processors/aggregators/llm_response.py

@@ -1024,10 +1024,8 @@ class LLMAssistantContextAggregator(LLMContextResponseAggregator):
         logger.debug(
             f"{self} FunctionCallCancelFrame: [{frame.function_name}:{frame.tool_call_id}]"
         )
-        if frame.tool_call_id not in self._function_calls_in_progress:
-            return
-
-        if self._function_calls_in_progress[frame.tool_call_id].cancel_on_interruption:
+        function_call = self._function_calls_in_progress.get(frame.tool_call_id)
+        if function_call and function_call.cancel_on_interruption:
             await self.handle_function_call_cancel(frame)
             del self._function_calls_in_progress[frame.tool_call_id]
 

src/pipecat/processors/aggregators/llm_response_universal.py

@@ -858,10 +858,8 @@ class LLMAssistantAggregator(LLMContextAggregator):
         logger.debug(
             f"{self} FunctionCallCancelFrame: [{frame.function_name}:{frame.tool_call_id}]"
         )
-        if frame.tool_call_id not in self._function_calls_in_progress:
-            return
-
-        if self._function_calls_in_progress[frame.tool_call_id].cancel_on_interruption:
+        function_call = self._function_calls_in_progress.get(frame.tool_call_id)
+        if function_call and function_call.cancel_on_interruption:
             # Update context with the function call cancellation
             self._update_function_call_result(frame.function_name, frame.tool_call_id, "CANCELLED")
             del self._function_calls_in_progress[frame.tool_call_id]