trivial: Be more useful when explaining the 'No Comment' error
trivial: Be more useful when explaining the 'No Comment' error

mitya57/appstream-glib,superm1/appstream-glib,mitya57/appstream-glib,hughsie/appstream-glib,ikeydoherty/appstream-glib,hughsie/appstream-glib,kalev/appstream-glib,kalev/appstream-glib,ikeydoherty/appstream-glib,ximion/appstream-glib,hughsie/appstream-glib,superm1/appstream-glib,ximion/appstream-glib,ximion/appstream-glib