Fix 409

[d-chambers]

Description

This PR fixes the metadata retrieval issue mentioned in #409, but it does not implement the custom DAS event format. We can do that in a latter PR if we really need to.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.84%. Comparing base (99f4468) to head (f5870f7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #410   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files         109      109           
  Lines        8843     8843           
=======================================
  Hits         8829     8829           
  Misses         14       14           

Flag	Coverage Δ
unittests	99.84% <100.00%> (ø)

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