reset client updates on crasch

Author: viktorvaladi

fedn/network/combiner/hooks/grpc_wrappers.py

@@ -26,6 +26,7 @@ def wrapper(self, request, context):
             try:
                 yield from fn(self, request, context)
             except Exception as e:
+                self.client_updates = {}
                 self._retire_and_log(func_name, e)
                 # Option B for streaming: signal an RPC error the client understands
                 context.set_code(grpc.StatusCode.FAILED_PRECONDITION)