Add extra checks for when serial is None #74
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I tested the lib on my Mac today, and found that when setting the serialport to None, the program would crash because some parts of
TMC_UARTreferencedself.serwithout a None-check. This PR adds extra error checks for this.Strangely, this only occurred after I switched my app's virtual environment from a normal venv to a Poetry venv. In any case, this error handling should be implemented.