fix for MODAPP-25.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5579 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_conference/mod_conference.c

@@ -4451,7 +4451,10 @@ static switch_status_t conference_new_install_caller_controls_custom(conference_
 	switch_xml_t xml_kvp;
 
 	assert(conference != NULL);
-	assert(xml_controls != NULL);
+
+	if (!xml_controls) {
+		return status;
+	}
 
 	/* parse the controls tree for caller control digit strings */
 	for (xml_kvp = switch_xml_child(xml_controls, "control"); xml_kvp; xml_kvp = xml_kvp->next) {