^D input on account choice causes infinite loop

[schmich]

• Try to copy password from account with multiple choices, hit Ctrl+D, see infinite loop

$ ward copy foo
Master password: 
Found multiple credentials matching "foo":
1. foo1@bar
2. foo2@bar
3. foo3@bar
> ^D
> ✗ Invalid choice.
> ✗ Invalid choice.
> ✗ Invalid choice.
> ✗ Invalid choice.
> ✗ Invalid choice.
...