`object_links` fails for objects with no links

Example CID of a small file with no links: `QmYPP3BovR2m8UqCZxFbdXSit6SKgExxDkFAPLqiGsap4X`

`object_links` fails, since the response does not contain links. (or maybe something else goes wrong, I don't see the response)
Interestingly, `object_get` works, since that maybe includes an empty links array 🙃 

Not sure if you want to fix this, since the `object` commands are deprecated.
