Fix error handling for parsed output

[jonnylangefeld]

parsed outputs always failed because the output string was empty.
Now we don't even add the output to the map in case of an error, but we write it to the debug output.

[codecov-commenter]

Codecov Report

Merging #23 (67c74b2) into master (a3d5745) will decrease coverage by 0.78%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   82.97%   82.19%   -0.79%     
==========================================
  Files           1        1              
  Lines         141      146       +5     
==========================================
+ Hits          117      120       +3     
- Misses         13       14       +1     
- Partials       11       12       +1     

Impacted Files	Coverage Δ
pkg/mc/mc.go	82.19% <83.33%> (-0.79%)	⬇️