[bug-gettext] gettext 0.19.8.1 mangles empty .desktop lines

[Bastien Nocera]

Original bug was in gnome-user-share:
https://gitlab.gnome.org/GNOME/gnome-user-share/issues/4

When applying a translation to a .desktop file with an empty value,
gettext will strip the line feed causing 2 lines to be merged
together. 

For example:
Categories=
NoDisplay=true

Would become, removing the "NoDisplay":
Categories=NoDisplay=true

Attached is a test case, unpack, and run "make". The resulting gnome-
user-share-webdav.desktop file should have 2 lines for Categories and
NoDisplay, but only has one.

gettext-empty-line-breakage-test-case.tar.xz
Description: application/xz-compressed-tar