Prevent exception when running unit tests

[drewnoakes]

Proposed changes

• Prevent exception when running unit tests when the entry assembly is null. This can make debugging smoother.

Test methodology

• Manual testing.

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✒️ I contribute this code under The Developer Certificate of Origin.

[codecov]

Codecov Report

Merging #8936 (bb7fd05) into master (8673ae8) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #8936      +/-   ##
==========================================
+ Coverage   56.05%   56.06%   +0.01%     
==========================================
  Files         925      925              
  Lines       65895    65899       +4     
  Branches    12088    12088              
==========================================
+ Hits        36938    36947       +9     
+ Misses      25945    25939       -6     
- Partials     3012     3013       +1     

Flag	Coverage Δ
production	43.31% <50.00%> (+<0.01%)	⬆️
tests	94.82% <ø> (ø)

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