Fix DatasourceItem re. Unexpected keyword argument 'default'

[amotl]

About

Compensate for a dashboard that apparently trips processing, as reported by @jwoodhouse. Thanks!

References

• Unexpected keyword argument 'default' #150

Q&A

Is it the right fix? / Is the fix right?

/cc @sanadhis, @rlauzon-ea

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (174fd9a) to head (9cc7849).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
+ Coverage   87.51%   87.52%   +0.01%     
==========================================
  Files           9        9              
  Lines        1089     1090       +1     
==========================================
+ Hits          953      954       +1     
  Misses        136      136              

Flag	Coverage Δ
unittests	87.52% <100.00%> (+0.01%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.