inprocess kernel has nothing to flush

Author: minrk

ipykernel/inprocess/ipkernel.py

@@ -87,6 +87,10 @@ async def _abort_queues(self):
         """ The in-process kernel doesn't abort requests. """
         pass
 
+    async def _flush_control_queue(self):
+        """No need to flush control queues for in-process"""
+        pass
+
     def _input_request(self, prompt, ident, parent, password=False):
         # Flush output before making the request.
         self.raw_input_str = None