Fix for csv preview with legacy_url_path #3781
Merged
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Reference issue:https://govuk.sentry.io/issues/4265154142/?alert_rule_id=3654813&alert_type=issue¬ification_uuid=8ab09d48-0416-4305-9e3c-0de49561a46a&project=202225&referrer=slack
Currently content item when it returns attachments, it returns modern url hence when it tries to find for legacy url, it fails and @attachment_metadata is empty this cause @attachment_metadata.first to be nil and hence the error.
With the fix we try to not rely on legacy_url_path, instead we look for the filename.