Allowed Asset Volumes breaks existing upload fields

[pixelmachine]

Description

If no Allowed Asset Volume is chosen then forms will trigger errors and cannot be edited.

Error is:

in_array(): Argument #2 ($haystack) must be of type array, string given
barrelstrength/sprout-forms/src/fields/formfields/FileUpload.php
line 162

How to reproduce

Don't select any "Allowed asset volumes" and try to edit a form with a file upload field.

Presumably if none are selected, then "All" should be selected by default. I think that's how it's done in Craft asset fields.

Sprout Version

3.14.0

Craft Version

3.9.10

Database Type Version

NA