The post can't be saved now unless it has a title and content.

Fixes [this issue](https://github.com/wordpress-mobile/WordPress-iOS-Editor/issues/441).

/cc @bummytime  
Right, I guess in my head `hasChanges` meant the post "revision" was changed with respect to the `original` (i.e. previously saved local copy).

What you say makes sense, and given `hasChanges` already returns `YES` if `self.hasRemote == NO`, we could also check for upload status.

Perhaps it just needs a more descriptive method name ;)