Unfortunately, Debian ships old Python (3.5 vs 3.8) and old pyscard
(1.9.4 vs 1.9.9). Calling PCSCCardConnection.disconnect() from a
destructor causes warnings about ignored exceptions:
AttributeError: 'NoneType' object has no attribute 'disconnect'
AttributeError: 'NoneType' object has no attribute 'setChanged'
AttributeError: 'NoneType' object has no attribute 'SCardDisconnect'
TypeError: 'NoneType' object is not callable
All these exceptions happen in pyscard's own destructors.
Change-Id: I9c644bc5fe9791b141a30bfc13647d77937a82ee