Removing all blogs and signing out of WordPress.com account leaves app in a partially unusable state

[tomwitkin]

Since there is not a logged out experience in the app, the NUX should show when all blogs are removed from the app along with the WordPress.com account, or the Reader should be made to work logged out..

[tomwitkin]

This will be fixed here: #538

[tomwitkin]

Fixed in this pull: #692