only yield actual users
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		|  | @ -139,6 +139,7 @@ class Presentation(models.Model): | |||
|     def speakers(self): | ||||
|         yield self.speaker | ||||
|         for speaker in self.additional_speakers.all(): | ||||
|             if speaker.user: | ||||
|                 yield speaker | ||||
|      | ||||
|     def __unicode__(self): | ||||
|  |  | |||
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	 Luke Hatcher
						Luke Hatcher