Backport v1.9 - Fixes #7492 - Fixes for DeleteFilePost function to work properly #7489
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Fixes #7492, backport for v1.9 from these fixes in PR #7478 for v1.10
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.F