[core, mod_commands, mod_verto] small tweaks to cache stuff to allow clear from verto and allow no domain to imply the default domain

src/mod/applications/mod_commands/mod_commands.c

@@ -6742,7 +6742,7 @@ SWITCH_STANDARD_API(xml_flush_function)
 		argc = switch_split(mycmd, ' ', argv);
 	}
 
-	if (argc == 3) {
+	if (argc > 1) {
 		r = switch_xml_clear_user_cache(argv[0], argv[1], argv[2]);
 	} else {
 		r = switch_xml_clear_user_cache(NULL, NULL, NULL);