Fix Standard Concept Check Bug; Update Unit Test for New DBConnector Version

[katy-sadowski]

Addresses #626 and #627

Also fixes some linter errors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.72%. Comparing base (cdae53b) to head (3d07fe8).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #628   +/-   ##
========================================
  Coverage    86.72%   86.72%           
========================================
  Files           17       17           
  Lines         1085     1085           
========================================
  Hits           941      941           
  Misses         144      144           

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