Null object languages Languages that allow the object to be omitted if it can be recovered from

Null object languages 

Languages that allow the object to be omitted if it can be recovered from the context. For example in Portuguese: 

“Eu fui ver roupas, mas não quis comprar. “
“I went to see clothes, but I didn’t want to buy [them]” 

In English you have to add and recover the meaning using a pronoun (them). In Portuguese the object of the verb “comprar” (to buy) can be omitted. 

Note that this is different from verb phrase ellision. 

If you guys know more languages with this feature (null object) that are not marked, please let me know.