Prevent null argument in compareByName; fixes #7360

[mernst]

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updates README text for jtreg usage (rewords bullets to include passing options, verifying duplicate errors, and running two separate compilation commands). Adds a new test for issue 7360 with three Java files: public class C (with public static C create() returning null), public class W (with public static W wrap(C) returning null), and package-private MyTest (method from() calling W.wrap(C.create())); test metadata specifies two compile steps using OptionalChecker. Modifies AnnotatedTypeMirror.hasExplicitAnnotation(...) to guard against a null primary annotation before checking explicit annotations.

Suggested reviewers

• smillst
• msridhar

🚥 Pre-merge checks | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

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✨ Finishing touches

• 📝 Generate docstrings

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