/usr/share/session-migration/scripts/unity-gnome-shell-migration.17.10.py:5:g_settings_set_property:object_set_property:g_object_new_internal:g_object_new_valist:g_object_new

[Impact]

 * Crash for people upgradring to 17.10 if are in the ubuntu session and don't have rhythmbox installed.

[Test Case]

 * Install 17.04
 * Uninstall rhythmbox
 * upgrade to 17.10
 * First login in the ubuntu session will result in the migration script crashing

[Regression Potential]

 * The script is already crashing, even if not functionally annoying (this is the last step of the migration script), this causes whoopsie to popup for those users. The fix ensure we just skip the rhythmbox part if the rhythmbox schema isn't installed.

The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-session. This problem was most recently seen with package version 3.26.1-0ubuntu4, the problem page at https://errors.ubuntu.com/problem/32345bd88e1c6091a5af096d1a5b22c13bdab1b6 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.