fix permissions for view_post, and 404 instead of redirecting

previously it was possible to see posts you didn't have permissions
to view, by using /view_post/<id>. now, this checks permissions.

previously if a post with the given id did not exist, it would
redirect you back to /, with an error message. now, it gives
a 404 page, which is consistent with the behaviour when a thread
or forum with the given id is not found.

0 files changed, 0 insertions, 0 deletions