Fix an undefined error

js/public/app.js

@@ -33,6 +33,9 @@ function arrayUnique(arr) {
 // Imported from ownCloud contact app
 app.filter('peerColor', function() {
 	return function(input) {
+		if (typeof input == 'undefined') {
+			return '';
+		}
 		// Check if core has the new color generator
 		if (typeof input.toHsl === 'function') {
 			var hsl = input.toHsl();