addClusterFacet: Add check for empty facetMatch

[asthabh23]

Description

This PR adds check for empty returned value for facetMatch.
It also covers enabling filters for clusterFacet.

Related Issue

#42

Motivation and Context

This came up as a requirement while enabling use of clusterFacet for URL facet

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[github-actions]

This PR will trigger a patch release when merged.

[trieloff]

Thank you. This would be even better with a test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.06%. Comparing base (85b5936) to head (37cda06).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   96.90%   97.06%   +0.16%     
==========================================
  Files          17       17              
  Lines        4750     4777      +27     
==========================================
+ Hits         4603     4637      +34     
+ Misses        147      140       -7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[adobe-bot]

🎉 This PR is included in version 1.16.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀