rtk gh pr list with no PRs prints "Pull Requests"

[alex-mextner]

Let's print "No Pull Requests"

[pszymkowiak]

[w] wshm · Automated triage by AI

🔍 Automated Triage

🐛 Category	bug
🟢 Priority	low
🎯 Confidence	82%

Summary

When rtk gh pr list returns no PRs, it prints the header "Pull Requests" with no content instead of a clear "No Pull Requests" message; fix the empty-state output.

This looks like a simple fix. Only repo maintainers can trigger auto-fix.

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