Improved error message and fixed minor issue when reading data from PINK.

[jesper-friis]

Description

Mini-PR. Improved er message and fixed minor issue when reading data from PINK.

Updated test_fromdicts() to also test the case of missing "@type".

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.84%. Comparing base (3f3ba09) to head (4d11f79).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #463   +/-   ##
=======================================
  Coverage   84.84%   84.84%           
=======================================
  Files          30       30           
  Lines        4565     4567    +2     
=======================================
+ Hits         3873     3875    +2     
  Misses        692      692           

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