From: Mischa POSLAWSKY <perl@shiar.org>
Date: Wed, 4 Jul 2018 16:53:30 +0000 (+0200)
Subject: thumb: error image also on unexpected exceptions
X-Git-Tag: v3.3~15
X-Git-Url: http://git.shiar.nl/minimedit.git/commitdiff_plain/31de5ab9716df36202127e9b1657ace23d499c4c?hp=31de5ab9716df36202127e9b1657ace23d499c4c

thumb: error image also on unexpected exceptions

Output is expected to be an image so avoid HTML responses.
Replace 501 placeholder by a common 500.png on any resize error.
Preserve message in X-Error header for debugging.
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