fix(waf): ignore waf acl set to empty string

[zac-nixon]

Description

Our documentation states that WAF ACL should be set to 'none' in order for it to be removed. Right now, an empty string ACL ARN will also remove it.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.48%. Comparing base (2fcd20d) to head (0d277bb).
⚠️ Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4888      +/-   ##
==========================================
+ Coverage   57.44%   57.48%   +0.03%     
==========================================
  Files         396      397       +1     
  Lines       31619    31709      +90     
==========================================
+ Hits        18164    18228      +64     
- Misses      12398    12422      +24     
- Partials     1057     1059       +2     

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[shraddhabang]

/lgtm

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: shraddhabang, zac-nixon

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