Make sure non-carriable light sources can't be picked up

apps/openmw/mwgui/inventorywindow.cpp

@@ -732,7 +732,8 @@ namespace MWGui
             && (type != typeid(ESM::Potion).name()))
             return;
 
-        if (object.getClass().getName(object) == "") // objects without name presented to user can never be picked up
+        // An object that can be picked up must have a tooltip.
+        if (!object.getClass().hasToolTip(object))
             return;
 
         int count = object.getRefData().getCount();