fix(iot-device): Fix NullReferenceException in MqttTransportHandler #1735
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_disconnectAwaitersCancellationSource CancellationTokenSource is disposed (and set to null) when the transport handler is disposed. Since this cts ;lifecycle is also managed through a scheduled cleanup task, which can run on a different thread in the event of an exception, we need to perform a null check before attempting cancellation.
Failure to do so ends in the code throwing a NullReferenceException.