Config no longer falsely loads profiles if file doesn't exist

[zigaLuksic]

As noticed by you, if the file doesn't exist one could do the first initialization with SHConfig("something") and break the whole damn thing.

I added a test that now the first init fails for any non-default profile (since no such profile exists).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3c4501c) 91.93% compared to head (3c4501c) 91.93%.

❗ Current head 3c4501c differs from pull request most recent head 8e4cc4f. Consider uploading reports for the commit 8e4cc4f to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #486   +/-   ##
========================================
  Coverage    91.93%   91.93%           
========================================
  Files           55       55           
  Lines         4800     4800           
========================================
  Hits          4413     4413           
  Misses         387      387           

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[jonasViehweger]

Looks good, thanks for fixing