[BUG][ABReader] Read from operation will throw error if file explorer is cancelled

[srowlandsdev]

Description:
As a user if I run any of the read operations and choose to cancel the action and close the pop up file explorer window then an Exception is thrown about the specified path not being of a legal form

Repro Steps:

1. Open the unity project
2. Select ABReader > Asset Bundle Folder > Read From Folder
3. Cancel the file explorer window
4. Await return in console

Repro Rate:
100%