If a blueprint is not valid, show text why it is not valid so the user can fix it.

Also do not show invalid blueprints in search an start workflow dropdown (https://screencast-o-matic.com/watch/cq6ni7ulDi). Buttons should be greyed out if not startable.

Video showing the new feature: https://www.screencast.com/t/YVwDYMAxhaMF