I don't think he was left out...But it does seem like Hermoine and HARRY are closer in the movies...
A friend thinks it's just for the people who watch the movies and don't read the books. It would be somewhat of a shocker when they fnd out who ends up together.
The movies make you think Harry/Hermie are gonna get together and I think that's the only reasoning by it.
However, I'll be rooting for more Ron scenes in OOTP.
~~RQT