use dtype with fallback

[katelbach]

Minor fix as I noted that ODIM H5 exports fail because the fallback value for dtype is not used in an if query.

• Tests added
• Changes are documented in history.md

[kmuehlbauer]

Thanks @katelbach! I think we can get this now. All in place!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.59%. Comparing base (c94d306) to head (e18e829).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #324   +/-   ##
=======================================
  Coverage   93.59%   93.59%           
=======================================
  Files          27       27           
  Lines        5653     5653           
=======================================
  Hits         5291     5291           
  Misses        362      362           

Flag	Coverage Δ
notebooktests	0.00% <0.00%> (ø)
unittests	93.59% <100.00%> (ø)

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