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whitespace in message custom_properties raises MQTT ValueError

See original GitHub issue

Unexpected error in <azure.iot.device.common.pipeline.pipeline_stages_mqtt.MQTTTransportStage object at 0x7f51ebf0b710>._run_op() call
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/azure/iot/device/common/pipeline/pipeline_stages_base.py", line 102, in run_op
    self._run_op(op)
  File "/usr/local/lib/python3.7/site-packages/azure/iot/device/common/pipeline/pipeline_thread.py", line 198, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/azure/iot/device/common/pipeline/pipeline_stages_mqtt.py", line 159, in _run_op
    self.transport.publish(topic=op.topic, payload=op.payload, callback=on_published)
  File "/usr/local/lib/python3.7/site-packages/azure/iot/device/common/mqtt_transport.py", line 533, in publish
    (rc, mid) = self._mqtt_client.publish(topic=topic, payload=payload, qos=qos)
  File "/usr/local/lib/python3.7/site-packages/paho/mqtt/client.py", line 1245, in publish
    raise ValueError('Publish topic cannot contain wildcards.')
ValueError: Publish topic cannot contain wildcards.

MQTTPublishOperation: completing with error Publish topic cannot contain wildcards.
SendOutputEventOperation: completing with error Publish topic cannot contain wildcards.
Callback completed with error Publish topic cannot contain wildcards.
['ValueError: Publish topic cannot contain wildcards.\n']