fixed db status 500 error

server.py

@@ -629,8 +629,11 @@ def dbstatus():
 	status = {}
 	variables = {}
 	for host in config.get('MYSQL_DBSTATUS_HOSTS', [])+[config.get('MYSQL_HOST', None)]:
+		try:
 			for _host in show('SHOW VARIABLES LIKE "wsrep_cluster_address"', host=host)['wsrep_cluster_address'][len('gcomm://'):].split(','):
 				hosts.add(_host)
+		except:
+			pass
 	for host in sorted(list(hosts)):
 		try:
 			status[host] = show('SHOW GLOBAL STATUS LIKE "wsrep%"', host=host)