Fix for missing user_metadata information in profile

app/view/main/MainModel.js

@@ -8,6 +8,6 @@ Ext.define('Rambox.view.main.MainModel', {
 		 name: 'Rambox'
 		,username: localStorage.getItem('profile') ? JSON.parse(localStorage.getItem('profile')).name : ''
 		,avatar: localStorage.getItem('profile') ? JSON.parse(localStorage.getItem('profile')).picture : ''
-		,last_sync: localStorage.getItem('profile') ? new Date(JSON.parse(localStorage.getItem('profile')).user_metadata.services_lastupdate).toUTCString() : ''
+		,last_sync: localStorage.getItem('profile') && localStorage.getItem('profile').user_metadata ? new Date(JSON.parse(localStorage.getItem('profile')).user_metadata.services_lastupdate).toUTCString() : ''
 	}
 });