Fall back to searching in as_store_get_app_by_pkgname()
Fall back to searching in as_store_get_app_by_pkgname()

If the user does:
 - as_store_load()
 - as_store_get_app_by_id()
 - as_app_add_pkgname()
 - as_store_get_app_by_pkgname()

Then we don't return the app. This is probably not what the user expects.

hughsie/appstream-glib,ximion/appstream-glib,ikeydoherty/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib,ximion/appstream-glib,ikeydoherty/appstream-glib,ximion/appstream-glib