Pressing Enter on question with [y/N] does not trigger default (N), instead quits Nimble
# Scenario

Nimble asks something like `Prompt: eth_keys@0.0.2 already exists. Overwrite? [y/N]`

## Expectation

Pressing Enter triggers default (N, as indicated by uppercase letter) and continues.

## What actually happens

Nimble quits without any feedback.