From: Mischa POSLAWSKY <perl@shiar.org>
Date: Fri, 12 Jul 2019 00:28:47 +0000 (+0200)
Subject: thumb: ensure exception message in X-Error header
X-Git-Tag: v4.0~4
X-Git-Url: http://git.shiar.net/minimedit.git/commitdiff_plain/f8288b710e1090d88dcacb0fa28823cdbe14072a?hp=f8288b710e1090d88dcacb0fa28823cdbe14072a

thumb: ensure exception message in X-Error header

Multiline convert warnings would be ignored; the first line should suffice.
Include the expected header regardless of fallback output.
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