in the report desinger I have:

 <Show>(self.episode_emails is not None) and self.episode_emails</Show>

It seems to be working for None, but not empty string.

 <expr>"[  ] %s %s" % (self.episode_emails, len(self.episode_emails))</expr>

makes "[ ] 0"

len(self.episode_emails) should be False, so it shouldn't show.

rfxml with sample data showing all 3 cases (empyt, non empty, None)

https://github.com/CarlFK/veyepar/blob/master/dj/main/templates/RecordingSheet_v2a.rfxml#L435

-- 
Carl K
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