Fix casting/actor selection

Sometimes a creator will cast me/assign me to a role and it shows up in my "Roles" but yet if you look at the audition, it still doesn't have the green bar surrounding the audition and it doesn't send me a notification that I've been cast. This is because the creator is missing a step somehow (although I don't know what step that is). The selection of the actor(s) should be one step or else it should give an error message if they try to assign a role without selecting the actors first. It is possible that letting the creator cast multiple people has allowed then to skip a step and not select anyone at all. So there could be an error message preventing them from casting without first making someone "Chosen" in green. Because that's the step that is sometimes skipped now