fix null check of edje file data

this fixes CID 1210812

src/lib/edje/edje_util.c

@@ -4449,6 +4449,7 @@ _edje_real_part_text_source_description_get(Edje_Real_Part *ep, Edje_Real_Part *
 
         et = (Edje_Part_Description_Text *)ep->param1.description;
         ed2 = _edje_fetch(ep->typedata.text->source->typedata.swallow->swallowed_object);
+        if (!ed2) return NULL;
         rp = _edje_real_part_recursive_get(&ed2, et->text.id_source_part);
         et = (Edje_Part_Description_Text *)rp->chosen_description;
      }