Merge pull request #199 from buchelew/patch-1

Update select.js

Author: dimirc

src/select.js

@@ -261,7 +261,7 @@
       if (ctrl.multiple){
         //Remove already selected items 
         $scope.$watchCollection('$select.selected', function(selectedItems){
-          if (!selectedItems) return;
+          if (!selectedItems.length) return;
           var data = ctrl.parserResult.source($scope);
           var filteredItems = data.filter(function(i) {return selectedItems.indexOf(i) < 0;});
           setItemsFn(filteredItems);