By: Addison Wylie Knight Rusty is a terribly hard movie to warm up to.  Mostly because it comes across as a padded-out episode of a television cartoon that would barely have enough steam to punch out at 22 minutes.  What’s worse is that Knight Rusty plays as one of the weaker adventures during one of the final seasons when the creators have started recycling ideas and effort. Right off the bat, moviegoers are thrown into…