KNX integrations not working anymore from 2021.6 upgrade on

Try to read the error message!

`Invalid config for [knx]: 
value must be one of 
['battery', 'battery_charging', 'cold', 'connectivity', 'door', 'garage_door', 'gas', 'heat', 'light', 'lock', 'moisture', 'motion', 'moving', 'occupancy', 'opening', 'plug', 'power', 'presence', 'problem', 'safety', 'smoke', 'sound', 'vibration', 'window'] 
for dictionary value 
@ data['knx']['binary_sensor'][7]['device_class']. Got 'None'.
[/quote]

The error is at

data['knx']['binary_sensor'][7]['device_class']
     |-> so its in `knx` config 
            |-> in a binary_sensor entity
                             |-> the 8th binary_sensor entity to be specific (it's 0-indexed 🤷)
                                |-> at the 'device_class' key

Got 'None'.
|-> it has to be one of the listed (or omitted completely because it's optional).
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