fix: emit_guarded no longer prints leading blank line when filtered is empty (fixes #4159)

[TechWizard9999]

Summary

Fixes #4159: was printing a stray leading blank line when the filtered body was empty and a tee hint followed.

Changes

• : Only insert the newline separator between body and hint when the filtered body is non-empty
• Added tests for the fix in module

Testing

• All new tests pass
• Existing tests should continue to pass

[rtk-wshm-sync-bot]

wshm · Automated triage by AI

📊 Automated PR Analysis

🐛 Type	bug-fix
🟢 Risk	low

Summary

Fixes a formatting bug in emit_guarded where an empty filtered body followed by a tee hint produced a stray leading blank line. The fix skips the newline separator when the filtered body is empty and adds unit tests covering the empty, non-empty, and no-hint cases.

Review Checklist

• Tests present
• Breaking change
• Docs updated

Linked issues: #4159

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Analyzed automatically by wshm · This is an automated analysis, not a human review.

[TechWizard9999]

Closing as duplicate of #4166 (first, Sep 21 vs Sep 27). #4166 has the identical one-line fix with minimal diff (+14/-0). My 2 extra tests (empty/separator/no-hint) can be added to #4166 if the maintainer prefers fuller coverage.