Bug#822657: gnome-music: Crash at launch

[Ognyan Kulev]

Package: gnome-music
Version: 3.20.0-2
Justification: renders package unusable
Severity: grave

After upgrading gnome-music from 3.18 to 3.20 in my Debian testing,  
gnome-music crashes at launch. The error is:

Traceback (most recent call last):
   File "/usr/bin/gnome-music", line 84, in <module>
     app = Application()
   File "/usr/lib/python3/dist-packages/gnomemusic/application.py", line 60, in
__init__
     cssProvider.load_from_file(cssProviderFile)
GLib.Error: gtk-css-provider-error-quark: application.css:23:21'-gtk-key-
bindings' is not a valid property name (3)



-- System Information:
Debian Release: stretch/sid
   APT prefers testing
   APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=bg_BG.UTF-8, LC_CTYPE=bg_BG.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-music depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gir1.2-glib-2.0                              1.48.0-2
ii  gir1.2-grilo-0.3                             0.3.0-1.1
ii  gir1.2-gst-plugins-base-1.0                  1.8.1-1
ii  gir1.2-gstreamer-1.0                         1.8.1-1
ii  gir1.2-gtk-3.0                               3.18.9-1
ii  gir1.2-mediaart-2.0                          1.9.0-2
ii  gir1.2-notify-0.7                            0.7.6-2
ii  gir1.2-totem-plparser-1.0                    3.10.6-4
ii  gir1.2-tracker-1.0                           1.8.0-2+b1
ii  gnome-settings-daemon                        3.18.2-1
ii  grilo-plugins-0.3                            0.3.0-1.1
ii  libatk1.0-0                                  2.20.0-1
ii  libc6                                        2.22-7
ii  libcairo-gobject2                            1.14.6-1+b1
ii  libcairo2                                    1.14.6-1+b1
ii  libgdk-pixbuf2.0-0                           2.34.0-1
ii  libglib2.0-0                                 2.48.0-1
ii  libgtk-3-0                                   3.18.9-1
ii  libpango-1.0-0                               1.40.1-1
ii  libpangocairo-1.0-0                          1.40.1-1
ii  python3                                      3.5.1-3
ii  python3-dbus                                 1.2.4-1
ii  python3-gi                                   3.20.0-2
ii  python3-gi-cairo                             3.20.0-2
ii  python3-requests                             2.9.1-3
pn  python3:any                                  <none>
ii  tracker                                      1.8.0-2+b1

gnome-music recommends no packages.

gnome-music suggests no packages.

-- no debconf information