v1.9 Backport for #7478 - Fix for bad error if Deleting a file has problems #7507
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Backport for PR #7478, cherry-picked, fixes #7474 & #7492.
Found that you could never get an error message when deleting a file as then it would try to use the edit file page template and that would throw errors. Also it had the wrong comparison sign for when looking to see if you can commit to the existing branch when you really want to make a new branch. Also makes sure users are redirected to the "compare" page for PR creation page when they chose to start a new branch when saving/deleting a file.