Fix 4728: Safety getBay, add unit test, turn down logging in one location

[Sleet01]

Adds an additional anti-null check when getting the Bay name for a Part for a Unit that may not have its Entity set yet.
This info should be corrected later in the campaign loading process anyhow.

NOTE: the save file in #4728 did display missing/destroyed DS bay doors and cubicles on my system following this fix, but I was not able to repro that with a brand new save replicating the TOE layout. This save may be useful for replicating this bug in the future.

Testing:

• Loaded OP's campaign save
• Added a unit test for the specific failure
• Ran all 3 projects' unit tests.

Close #4728

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.81%. Comparing base (ce35073) to head (2b09f20).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4731   +/-   ##
=========================================
  Coverage     10.80%   10.81%           
- Complexity     5712     5715    +3     
=========================================
  Files           950      950           
  Lines        131289   131302   +13     
  Branches      19136    19141    +5     
=========================================
+ Hits          14186    14194    +8     
- Misses       115879   115881    +2     
- Partials       1224     1227    +3     

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