Allow empty Stylelint input on precommit

[connor-baer]

Purpose

When committing changes only to CSS files listed in .stylelintignore, Stylelint throws an error.

Approach and changes

• Allow empty input to Stylelint on precommit

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 4de49af

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup-oss/foundry	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.72%. Comparing base (bb9e28f) to head (4de49af).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1040   +/-   ##
=======================================
  Coverage   65.72%   65.72%           
=======================================
  Files          29       29           
  Lines        1733     1733           
  Branches      146      146           
=======================================
  Hits         1139     1139           
  Misses        579      579           
  Partials       15       15           

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