#898990 by dereine: Fix bad SQL generated on related terms relationship if no vocabularies selected.

#941990 by master-of-magic: Link to node when using relationships could occasionally lose track and create bad links.

#667014 by dereine: Prevent notice with relationships and node row style if relationship has no endpoint node.

#366886 by Scott Reynolds: For "last comment time" if "count zero is empty" is set, use empty text for nodes with no comments.

#872000 by NaX: Comment edit field needs option to set destination so it can work like comment edit field.

inside argument_validate_user (patch 34).