Remove unused else block in client streaming receive function

[dilanSachi]

Description: In client streaming, when the server is sending Empty messages, the client's receive method currently looks as follows.

isolated remote function receive() returns grpc:Error? {
    var response = check self.sClient->receive();
    if response is () {
        return response;
    } else {
        _ = response;
    }
}

The else block is not needed and we need to remove it.

[AnsarMahir]

@keizer619 is this still valid? If yes, Can i work on this ??