Check that traits are set prior to assignment

[bitcanon]

Nice, I have been testing in my system today and it is working. Only issue I had it was with the GSM device, which is not reporting the signal so the get_devices was failing on line 181 alarm.py so I added a check as a workaround:

elif device['device_type'] == 'GSM':
                if 'signal_level' in device['traits'].keys():
                    signal_level=device['traits']['signal_level']['level']
                else:   
                    signal_level=0
                contact_device = GSMDevice(
                    device_number=device['device_number'],
                    device_type=device['device_type'],
                    enrollment_id=device['enrollment_id'],
                    id=device['id'],
                    name=device['name'],
                    partitions=device['partitions'],
                    preenroll=device['preenroll'],
                    removable=device['removable'],
                    renamable=device['renamable'],
                    subtype=device['subtype'],
                    warnings=device['warnings'],
                    zone_type=device['zone_type'],
                    signal_level=signal_level
                )

If you have time maybe you can check the inputs before assign them, traits seems to be quite tricky.

Originally posted by @amaduain in https://github.com/bitcanon/visonicalarm/issues/16#issuecomment-1351294575