Denormalize from_url_without_rest onto the redirects model #6780
We first perform a `.count()` query to check if the DB SQL query will fail. If it fails, we ignore the `exact` Q object and we continue with the redirects check ignoring all the Exact Redirects for this project. This query will *only fail* if there is at least one Exact Redirect with less than 5 chars long on this project. This is because we are substracting the `$rest` part from the `from_url` field and we can't end up with a negative number.
It's better to keep `from_url_without_rest` as None instead of `''` for non-Exact Redirect type.
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