Tidy null checks in AbstractGenerateMojo.java

[ascopes]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.69%. Comparing base (41a4175) to head (3585e3c).
Report is 1 commits behind head on main.

❗ Current head 3585e3c differs from pull request most recent head 4292d05. Consider uploading reports for the commit 4292d05 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
- Coverage   82.75%   82.69%   -0.06%     
==========================================
  Files          23       23              
  Lines         771      768       -3     
  Branches       49       49              
==========================================
- Hits          638      635       -3     
  Misses        112      112              
  Partials       21       21              

Files	Coverage Δ
...opes/protobufmavenplugin/AbstractGenerateMojo.java	78.00% <100.00%> (-1.24%)	⬇️