An error occurred
* Fix 500 on first wiki page There is a mistake in #16319 An error occurred and #16487 An error occurred which means that the first time a wiki page is created a 500 is reported because the `master` branch is not in existence in that wiki yet. This PR simply checks for this error and returns not found. Fix #16584 An error occurred Signed-off-by: Andrew Thornton <art27@cantab.net>
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