Fix: Converted Cultists not receiving objectives

For some reason Sabbat moved the line that executes the memorize_cult_objectives proc into an if statement that checks if the mob doesn't have a cult_mind...
Really fixed the Free Objective bug this time!

Changed get_unconvertables to search in player_list instead of mob_list - it was picking up the dead clowns on the banarium shuttle, which of course had no mind datum.
Added a check to that proc to make sure the mob has a mind datum
Added some admin log messages to notify them of errors.
removed debug edits
Merge pull request #1569 from Malkevin/cultbugs

Fix: Converted Cultists not receiving objectives