Allow confirmation of zero assets

[adamcastleman]

Is your feature request related to a problem?
Currently, you are allowed to pass in assets to load the picker with pre-selected media. You can then select and deselect at will, except when you deselect all media. When the assets are 0, the confirm button is disabled.

Describe the solution you'd like
You should be able to select 0/x media, essentially deselecting all entries. Currently, there is no way to confirm a zero selection from the picker itself. The confirm button should work for any number of media selections, including zero.

Describe alternatives you've considered
There are essentially no other workarounds to this problem. You must remove the final asset outside of the picker.

[AlexV525]

I think making 0 assets available if there are selected assets previously would be a proper solution.