Unordered list is cleared when an invalid filetype is dragged and dropped

[chriswrightnomuda]

angular.module('app',['ngFileUpload']); angular.module('app').controller('myController', ['$scope', 'Upload', function ($scope, Upload) { $scope.fruits = ["Apple", "Banana", "Cherry", "Lemon","Melon","Orange","Peach","Raspberry","Strawberry"];

    `$scope.uploadFiles = function (files) {
        if (files && files.length) {
            for (var i = 0; i < files.length; i++) {
                Upload.upload({url: 'upload/url', data: {file: files[i]}, 'username': "Me"});
            }
        } else {
            alert("Where did my list go?");             
        }
    }
}

])