FileUpload remove method throwing error on Firefox

[bnymncoskuner]

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Current behavior

On FileUpload component, when user selects a file, it is listed within the component with a remove button which calls remove method.

this.onRemove.emit({originalEvent: event, file: this.files[index]});

On the line above, event is undefined when the method is invoked. Therefore, Firefox throws an error.
I implemented my own remove button and I call this method with index as well. It gives me the same error.

Expected behavior

It should not throw an error on undefined event, or event should be passed to the function somehow.

Minimal reproduction of the problem with instructions

You can reproduce this bug on primeng demo page. Choose a file and try to use remove button (next to the selected file)
https://www.primefaces.org/primeng/#/fileupload

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 2.0.X

• PrimeNG version: 2.0.X

• Browser: [all | Chrome XX | Firefox 53 | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript X.X | ES6/7 | ES5]

• Node (for AoT issues): node --version =