AttributeError: 'Namespace' object has no attribute 'func'

[charlieh0tel]

pi@pirim:~/src/SA818.ch $ ./sa818.py 
Traceback (most recent call last):
  File "./sa818.py", line 342, in <module>
    main()
  File "./sa818.py", line 332, in main
    if opts.func == 'version':
AttributeError: 'Namespace' object has no attribute 'func'
pi@pirim:~/src/SA818.ch $ 

I don't see this on x86_64 ubuntu. So .... ??

Pi: Package: python3 Version: 3.7.3-1 Ubuntu: python3 Version: 3.8.2-0ubuntu2

[0x9900]

One of the subcommands should be mandatory.

% ./sa818.py
sa818: error: the following arguments are required: {radio,volume,filters,version}