Fix hoomd version handling in convert_hoomd.py

[chrisjonesBSU]

I've noticed a bug that you will get hoomd not defined error when importing anything from gmso.external (even from_mbuild and to_mbuild) and don't have hoomd in your environment.

This is happening because the hoomd import in convert_hoomd is under an if statement, but a few lines later we call hoomd.version

@CalCraven @daico007 should we do a quick patch release to get this fix in the conda package asap?

[daico007]

Yeah, I think this warrants a patch release

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.04%. Comparing base (5b3040a) to head (855f07a).
Report is 60 commits behind head on main.

Files with missing lines	Patch %	Lines
gmso/external/convert_hoomd.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
- Coverage   94.09%   94.04%   -0.05%     
==========================================
  Files          65       65              
  Lines        6870     6953      +83     
==========================================
+ Hits         6464     6539      +75     
- Misses        406      414       +8     

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[CalCraven]

Yea let’s release merge this and then this weekend do another patch release.