Exception: Traceback (most recent call last):
File "/home/ha/ha_conf/custom_components/sensor/aircat.py", line 51, in update
self.handle(fd)
File "/home/ha/ha_conf/custom_components/sensor/aircat.py", line 92, in handle
if len(mac) > 0 and len(self._macs.get(mac)):
TypeError: object of type 'NoneType' has no len()