Relax logging when dashboards defined as variables can not be found

[amotl]

About

Too much logging is annoying.

References

• Bug: Data source names seem to be used as UID's in code if data source is set in a dashboard by a dashboard variable #187

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.51%. Comparing base (77aec2b) to head (644eedc).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   84.51%   84.51%           
=======================================
  Files           9        9           
  Lines        1124     1124           
=======================================
  Hits          950      950           
  Misses        174      174           

Flag	Coverage Δ
unittests	84.51% <100.00%> (ø)

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[amotl]

This one might be a better patch.

• Fix collecting data sources defined by dashboard variables #196