sorcery: Output an error message if a wizard is specified for an object type and it isn't found.

ASTERISK-24612 #close
Reported by: Joshua Colp
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Merged revisions 431771 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431772 65c4cc65-6c06-0410-ace0-fbb531ad65f3