CardConnection: fix PEP8 warnings
CardConnection: fix PEP8 warnings

CardConnection.py:50:33: E127 continuation line over-indented for visual indent
CardConnection.py:64:17: E711 comparison to None should be 'if cond is not None:'
CardConnection.py:152:17: E711 comparison to None should be 'if cond is not None:'
CardConnection.py:183:17: E711 comparison to None should be 'if cond is not None:'
CardConnection.py:204:17: E711 comparison to None should be 'if cond is not None:'

LudovicRousseau/pyscard,LudovicRousseau/pyscard,LudovicRousseau/pyscard