[BUG] TritonClient.grpc.InferResult get_output() does not return properly

[charlie831007]

InferResult.get_output() function does not work properly when the attribute as_json is set to True.
If as_json is set to True, the output is not returned.

client/src/python/library/tritonclient/grpc/_infer_result.py

Lines 126 to 127 in 2aa5844

	if as_json:
	MessageToJson(output, preserving_proto_field_name=True)