Fix mavis config TypeError when invalid tool is given

[mattdoug604]

Instead of raising the intended KeyError, a TypeError was being raised when 'self.values()' is None. This happens when a single tool is given as input and that tool is invalid.

[codecov[bot]]

Codecov Report

Merging #250 (d82407e) into develop (f3c76b7) will increase coverage by 9.57%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #250      +/-   ##
===========================================
+ Coverage    81.49%   91.06%   +9.57%     
===========================================
  Files           57       57              
  Lines        10319    10319              
===========================================
+ Hits          8409     9397     +988     
+ Misses        1910      922     -988     

Flag	Coverage Δ
unittests	91.06% <100.00%> (+9.57%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mavis/constants.py	94.04% <100.00%> (+0.42%)	:arrow_up:
mavis/annotate/fusion.py	96.02% <0.00%> (+0.33%)	:arrow_up:
mavis/util.py	88.25% <0.00%> (+0.33%)	:arrow_up:
mavis/config.py	88.69% <0.00%> (+0.50%)	:arrow_up:
mavis/bam/cigar.py	98.14% <0.00%> (+0.61%)	:arrow_up:
mavis/schedule/job.py	78.26% <0.00%> (+0.72%)	:arrow_up:
mavis/cluster/main.py	90.24% <0.00%> (+0.81%)	:arrow_up:
mavis/annotate/genomic.py	93.12% <0.00%> (+1.03%)	:arrow_up:
mavis/breakpoint.py	94.61% <0.00%> (+1.15%)	:arrow_up:
... and 20 more

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[creisle]

@mattdoug604 can you also PR this branch into dev_v3 (like the other PR)

[mattdoug604]

@mattdoug604 can you also PR this branch into dev_v3 (like the other PR)

Done: https://github.com/bcgsc/mavis/pull/252