Queries a message buffer to see if it is empty.
A message buffer is empty if it does not contain any messages.
Message buffer functionality is enabled by including the FreeRTOS/source/stream_buffer.c
source file in the build (as message buffers use stream buffers).
Parameters:
xMessageBuffer
The handle of the message buffer being queried.
Returns:
If the message buffer is empty then pdTRUE is returned. Otherwise
pdFALSE is returned.
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