Checklist

• Read CONTRIBUTING.md.
• PR title is short and non-generic (see previously merged PRs for examples).
• PR only implements a single feature or fixes a single bug.
• Tests passing (uv run pytest tests)?
• Lint / pre-commits passing (pre-commit run --all-files)?

Description

Related Issues

Screenshots / Recordings

Steps to QA

Summary by cubic

Normalized expression handling in the Action Panel form to trim values, treat whitespace-only and ${{ }} as empty, and persist run_if as null when unset. Prevents saving invalid control-flow fields and keeps payloads consistent.

• Refactors
  • Added EMPTY_TEMPLATE_EXPRESSION_RE and normalizeOptionalExpression to return undefined for empty or ${{ }} expressions.
  • Applied normalization to for_each (arrays/strings), run_if, retry_until, wait_until, and environment; for arrays, map and drop undefined items.

^{Written for commit a0b9843. Summary will update on new commits.}