Use gnc_pricedb_has_prices instead of testing the return value of get_prices.

src/gnome/dialog-commodities.c

@@ -164,8 +164,7 @@ remove_clicked (CommoditiesDialog *cd)
     g_list_free (accounts);
 
     pdb = gnc_pricedb_get_db (cd->book);
-    prices = gnc_pricedb_get_prices(pdb, commodity, NULL);
-    if (prices)
+    if (gnc_pricedb_has_prices(pdb, commodity, NULL))
     {
         message = _("This commodity has price quotes. Are "
                     "you sure you want to delete the selected "