Collection is briefly shown when opening a game from file
Migrated from https://bugzilla.gnome.org/show_bug.cgi?id=782368
When Games is asked to open URIs it will continue to display the current page, being the collection or the game display. We should instead inform the user that Games is preparing the game. It could be implemented as a "preparation" step inbetween the "collection" and "display" ones. Such a page would be the perfect one to display an error when no single game is found for the given URI.