Fixed empty UID/GID users/groups show without check

source/ubl-settings-usergroups.c

@@ -1919,12 +1919,12 @@ gboolean on_filter(GtkTreeModel* model, GtkTreeIter *iter, main_window *widgets)
 		search_found = 1;
 	}
 	if (systemed){
-		if (((iuid>=main_config.MINUID&&iuid<=main_config.MAXUID))||show_system){
+		if (!iuid||((iuid>=main_config.MINUID&&iuid<=main_config.MAXUID))||show_system){
 			system_id_found = 1;
 		}
 
 	} else {
-		if (((atoi(uid)>=main_config.MINUID&&atoi(uid)<=main_config.MAXUID))||show_system){
+		if (yon_char_is_empty(uid)||((atoi(uid)>=main_config.MINUID&&atoi(uid)<=main_config.MAXUID))||show_system){
 			system_id_found = 1;
 		}