Empty preview

Took me a long time to track down this bug to this module, but eventually I have.

When inlinks are turned on for a node, previewing the node shows absolutely no content at all.

This is due to the function textlinkads_inlinks_add_links not returning anything when the node id is not set, which is the case in preview.

Adding return $data; at the end of this function should fix the problem (I'm not sure how to write patches so I'll let someone else do that).