end on empty choice, allow end of input stream with ^D

[sleep-walker]

use empty choice to abort, it implies that ^D also works which is natural for console tools

[Dushistov]

@sleep-walker

It is good to have, but it change behaviour,
if somebody use it in interactive mode it may break things.

Do you read comment to this d2327e2 ,
I suppose with ~/.intputrc you can change sdcv behaviour as you want,
without any code modification?

If it is not enought for you, then may be introduce some environment variable
to save old behaviour?

[sleep-walker]

Thanks for the tip - ~/.inputrc configuration works as workaround for my problem nicely enough.