Debug interface commands "force_open" and "force_off" are not working

[martukas]

Current behaviour/situation

[sn:e1] set force_off
usage: debug_cli.py [-h] var data [data ...]
Encountered a parse error: debug_cli.py: error: the following arguments are required: data

[sn:e1] set force_open
usage: debug_cli.py [-h] var data [data ...]
Encountered a parse error: debug_cli.py: error: the following arguments are required: data

Expected state/behaviour
These commands should run exactly as written.

How do you know it is wrong
These commands do not require an additional parameter, and they used to work prior to #1290

Starting points
You can compare the code for the do_set function in the above-mentioned PR to see what the logic was prior to the changes that broke this functionality. The way the parser is set up for this sub-command does not respect the original logic that makes the data parameter optional.