[gnome-software: 7/7] Merge branch '1225-do-not-allow-distro-upgrades-if-release-art-is-missing' into 'main'

[Milan Crha <mcrha src gnome org>]

commit 22a5d0ce0ec62c39efac263b851b4a5fa8f78427
Merge: 21fccf121 a1cdfbf1b
Author: Milan Crha <mcrha redhat com>
Date:   Thu Aug 12 17:22:35 2021 +0000

    Merge branch '1225-do-not-allow-distro-upgrades-if-release-art-is-missing' into 'main'
    
    Resolve "Do not allow distro upgrades if release art is missing"
    
    Closes #1225
    
    See merge request GNOME/gnome-software!864

 data/assets/upgrade-bg.png                         | Bin 308691 -> 15441 bytes
 data/org.gnome.software.gschema.xml                |   5 +++
 .../gs-plugin-fedora-pkgdb-collections.c           |  35 +++++++++++++++++++--
 src/gtk-style.css                                  |   4 +--
 4 files changed, 39 insertions(+), 5 deletions(-)
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