Error when adding Deploy Key in onboarding flow

[jvanbaarsen]

We get a nil exception when on the Add Deploy Key page in the onboarding flow. This is caused by this change: https://github.com/intercity/intercity/pull/9/files#diff-2025835ff2ba944dedb95b83c1c28548R10

[jvanbaarsen]

Temporarily fixed by: https://github.com/intercity/intercity/commit/d8e9687445cee192119fe602ea5aea2f11ed088f