snapcraft create-key displays an ugly error when the keys don't match

Metadata

Project: snapcraft
Number: #1637623
Type: issue
State: open
Author: ~elopio
Labels: store ui
Created: 2016-10-28 19:34:13.641548+00:00
Updated: 2016-11-08 06:18:14.782516+00:00
Closed: —

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Issue body

To reproduce, run snapcraft create-key and confirm the wrong password. $ snapcraft create-key Passphrase: Confirm passphrase: error: passphrases do not match Command '['snap', 'create-key', 'default']' returned non-zero exit status 1

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