fix: exit 0 with empty output when no files are provided

[robaone]

Problem

When a PR only deletes files, tj-actions/changed-files returns nothing in all_changed_files (deletions are excluded by default). This produces empty input to parse_file_list_for_projects.sh, which was exiting with code 1.

Fix

Changed the empty-input guard to exit 0 — no files to process means no projects to build, which is valid (not an error).

Reproducer

PR robaone/source#323 fails because it only deletes projects/ai-prompts/claude/skills/swan-peer-review-needs-review/SKILL.md.

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