Improvement: clearer error message when creating a distributed cmesh

[dutkalex]

Describe your changes here:
This PR adds a hint to fix the problem of creating distributed meshes with empty partitions, following a discussion with @holke. This problem could also be eliminated completely by performing an MPI_[All]gather and using that information to both propagate the information to the eventual empty partitions, as well as checking that all the partitions agree on the dimension. This robustness enhancement would definitely cost some CPU cycles though, but I don't have enough context to evaluate if this would be an acceptable tradeoff.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.42%. Comparing base (b9633d6) to head (8d18de6).
⚠️ Report is 597 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1874   +/-   ##
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  Coverage   74.42%   74.42%           
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  Files         101      101           
  Lines       19204    19204           
=======================================
  Hits        14293    14293           
  Misses       4911     4911           

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