fix/core_resources

[NeonJarbas]

when using CoreResources skill_id is not set and an exception was thrown when scanning the user resources override path

a check is now added for skill_id

[codecov]

Codecov Report

Merging #145 (10abbd3) into dev (6ceb058) will increase coverage by 2.32%.
The diff coverage is 41.64%.

@@            Coverage Diff             @@
##              dev     #145      +/-   ##
==========================================
+ Coverage   50.35%   52.68%   +2.32%     
==========================================
  Files         119      150      +31     
  Lines       10077     9713     -364     
==========================================
+ Hits         5074     5117      +43     
+ Misses       5003     4596     -407     

Impacted Files	Coverage Δ
mycroft/audio/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/arduino.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/eyes.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/mouth.py	0.00% <0.00%> (ø)
mycroft/client/speech/__main__.py	0.00% <0.00%> (ø)
mycroft/client/speech/hotword_factory.py	0.00% <0.00%> (-88.89%)	⬇️
mycroft/client/speech/service.py	0.00% <0.00%> (ø)
mycroft/client/speech/silence.py	0.00% <0.00%> (-42.86%)	⬇️
mycroft/client/text/__init__.py	0.00% <0.00%> (ø)
... and 117 more

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