event.targetScope.fileName is undefined

[ThijsWouters]

When the file-dropzone-drop-event is emitted, event.targetScope.fileName is undefined.
This is due to this line:

 scope.fileName = name if angular.isString scope.fileName

Why is this check needed?

[ThijsWouters]

I already found another way to get the file name. I needed to pass the data to the event listener.
But still, in the scope this field is still undefined.