A sysdiagnose tarball whose download stopped halfway ends in an EOFError
from gzip while check-sysdiagnose extracts it. Click turns EOFError into
click.Abort, so the command printed nothing but "Aborted!", even with
-v. The extraction now catches the read errors an archive can raise,
names the file and the reason at critical level, says the file may be
truncated or not a gzip tarball, and exits 1. A plain .tar given to the
gzip reader gets the same message rather than a traceback.
Donncha Ó Cearbhaill
92f780df5a