Handle non-existent HX-Retarget element #2222
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Description
As per the issue, HX-Retarget performed no handling of whether the resultant target element actually existed or not. This PR adds error handling seen in other places and gracefully returns from the function.
Corresponding issue: Resolves #2216
Testing
Tested via an automated test and manually with the reproduction steps in the original issue.
Checklist
masterfor website changes,devforsource changes)
approved via an issue
npm run test) and verified that it succeeded