Add Check for map filter in search-results

[vouidaskis]

Types of changes

• Bugfix (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 not work as expected)

Description of Change

Check if map filter exists to prevent undefined error when loading the search results
If a migration removes the map filter from standard-search-view config the search results are empty and an error is thrown

Issues Solved

Closes #11951

Checklist

• I targeted one of these branches:
  • dev/8.0.x (under development): features, bugfixes not covered below
  • dev/7.6.x (main support): regressions, crashing bugs, security issues, major bugs in new features
  • dev/6.2.x (extended support): major security issues, data loss issues
• I added a changelog in arches/releases
• I submitted a PR to arches-docs (if appropriate)
• Unit tests pass locally with my changes
• I added tests that prove my fix is effective or that my feature works
• My test fails on the target branch

[chiatt]

@vouidaskis Thanks for submitting this PR. Could you please provide a little more information on how to reproduce this error? Also, for future PRs, could you submit an issue that describes the problem in advance of the PR?

[vouidaskis]

@vouidaskis Thanks for submitting this PR. Could you please provide a little more information on how to reproduce this error? Also, for future PRs, could you submit an issue that describes the problem in advance of the PR?

Thanks, i just created an issue explaining this issue

[chiatt]

Could you move the changelog entry to the latest release notes?

[chiatt]

It would be safer just to check if this.mapFilter has any value rather than specifically for null.

Suggested change

	if (this.mapFilter !== null){
	if (this.mapFilter){

[apeters]

Can you move this comment in the release notes to 7.6.13.md