Bug#784397: devscripts: [debchange] Support un-finalised trailer line for UNLRELEASED changelog entry

[Ben Finney]

Package: devscripts
Version: 2.15.5
Severity: minor
Control: tags + patch

When working with Emacs ‘debian-changelog-mode’ it is normal to have
the latest changelog entry set to distribution “UNRELEASED”, and have
the trailer line unfinalised — since the release is not ready.

Currently ‘debchange --release’ will fail with the following error::

=====
$ debchange --release
parsechangelog/debian: warning:     debian/changelog(l21): badly formatted trailer line
LINE:  --
parsechangelog/debian: warning:     debian/changelog(l23): found start of entry where expected more change data or trailer
LINE: python-lockfile (1:0.10.2-1) experimental; urgency=low
parsechangelog/debian: warning:     debian/changelog(l23): found eof where expected more change data or trailer
debchange: fatal error at line 645:
No maintainer in changelog!
=====

Instead, ‘debchange --release’ should recognise an unfinalised trailer
line as valid for this action, and replace the line with a finalised
trailer line for the release.

Attached is a suggested patch for this behaviour.

-- 
 \       “From the moment I picked your book up until I laid it down I |
  `\        was convulsed with laughter. Someday I intend reading it.” |
_o__)                                                    —Groucho Marx |
Ben Finney <ben at benfinney.id.au>
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