Focus preview even If website fetch url doesn't exist #9289
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Description:
PR #8894 rework the preview of Focus with iframe. It works properly, but preview display just If website url to fetch exists.
But in Mautic 2 preview works even If website URL not exists.
This is confusing for migrate instances from M2 to M3.
This PR allow generate preview even If url does not exists.
Steps to test this PR: