fix exception while printing poster URL

[jrelax]

Fixes the exception below

on 0: This is one of Plex' posters for Movie-1234: https://image.tmdb.org/t/p/original/xxxx.jpg on 0: Exception processing "Movie": name 'ppo' is not defined

[chazlarson]

Thanks for the contribution!

But as it happens this afternoon I pushed a big refactor that also included this.