check if source_list is None before treating as array

[kheyse]

len(None) will throw an error

[codecov]

Codecov Report

Merging #550 (fd700cc) into main (554ef06) will increase coverage by 0%.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #550   +/-   ##
===================================
  Coverage    96%    96%           
===================================
  Files        59     60    +1     
  Lines      2470   2476    +6     
===================================
+ Hits       2368   2374    +6     
  Misses      102    102           

Impacted Files	Coverage Δ
...ontrollerx/cx_core/type/media_player_controller.py	98% <100%> (ø)
apps/controllerx/controllerx.py	100% <0%> (ø)
apps/controllerx/cx_devices/smartkontakten.py	100% <0%> (ø)

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[xaviml]

Hi @kheyse,

Thank you for the PR, I also added the Optional when source_list is declared, so we ensure mypy understands it can be None.

Regards,
Xavi M.