I think Missy would be in the video, it would be a bit strange if she wasn't in the video at all, what would they show during her part then? I can't think of an example where the feature artist isn't shown in the music video tbh..
I'm sure there is some out there on the top of my head
Far East Movement - Live My Life ft. Justin Bieber - they did not have Justin Bieber
And Jennifer Lopez ft Lil' Wayne - did not have Lil' Wayne I believe he was in prison at the time......