Ensure rejected push to refs/pull/index/head fails nicely (#11724) #11809
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Backport #11724
A pre-receive hook that rejects pushes to refs/pull/index/head
will cause a broken PR which causes an internal server error
whenever it is viewed. This PR handles prevents the internal server
error by handling non-existent pr heads and sends a flash error
informing the creator there was a problem.
Signed-off-by: Andrew Thornton [email protected]