Add an extension set test for plugins that don't provide an extension
Add an extension set test for plugins that don't provide an extension

chergert/libpeas,gregier/libpeas,Distrotech/libpeas,chergert/libpeas,gregier/libpeas,gregier/libpeas,GNOME/libpeas,Distrotech/libpeas,Distrotech/libpeas,chergert/libpeas,GNOME/libpeas,gregier/libpeas