Have to prompt user to upload keys like we do when no domain

We currently error in the git configuration page of the application wizard if the user did not add any keys to his OpenShift account:

He can then hit the "SSH Keys Wizard" link, get to the ssh keys management wizard and upload a key. The error will then go away and the user can process, create/import his application.
We should not error, we should prompt the user to upload keys if we see that he has none (on OpenShift) so far. We do the very same with the domain. If the user launches the wizard, he'll get a dialog that asks him to create a domain. The application wizard will only appear on successfull creation of the domain.