rdhabalia opened a new pull request #2225: Set empty response to complete grpc 
txn
URL: https://github.com/apache/incubator-pulsar/pull/2225
 
 
   ### Motivation
   
   when function worker resets metrics for process running on grpc client, it 
doesn't send response back to server so, we can below error when 
function-worker resets the metrics.
   ```
   io.grpc.StatusRuntimeException: CANCELLED: HTTP/2 error code: CANCEL 
Received Rst Stream
   ```
   
   ### Modifications
   
   send empty response to server to avoid error message for reset metrics call.
   
   ### Result
   
   function worker will not have failure while reseting metrics.
   

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