compare-locales generates this error
Unparsed content "; This Source Code Form is subject to the terms of the Mozilla Public ; License, v. 2.0. If a copy of the MPL was not distributed with this ; file, You can obtain one at http://mozilla.org/MPL/2.0/. [Strings]" at 0-209
Adding this comment makes the error disappears
# This file is in the UTF-8 encoding
My suspicion is that http://hg.mozilla.org/l10n/compare-locales/file/f4effbecaaec/lib/Mozilla/Parser.py#l355 doesn't allow the empty line in that constellation.
Path to fix would be to mimic the tests in http://hg.mozilla.org/l10n/compare-locales/file/f4effbecaaec/lib/Mozilla/tests/unitProperties.py, verify that it breaks, and then patch.
In other words, this is a nice patch for someone to start hacking on compare-locales.
Seeing that on https://l10n.mozilla.org/dashboard/compare?run=224504 as well, and there the empty lines come from the originals, see http://hg.mozilla.org/comm-central/file/4efc4d422213/suite/locales/en-US/crashreporter/crashreporter-override.ini and http://hg.mozilla.org/comm-central/file/4efc4d422213/suite/locales/en-US/updater/updater.ini
I also updated the seamonkey runs for central and aurora.