Nulldata transaction information Can someone give more information on that type of transaction? Why is it useful for the network. Can it be claimed since it has OP_RETURN command?
From he official Developer Guide:


  Null data scripts let you add a small amount of arbitrary data to the
  block chain in exchange for paying a transaction fee, but doing so is
  discouraged. (Null data is a standard script type only because some
  people were adding data to the block chain in more harmful ways.)
  
  
    script: OP_RETURN &lt;data> (Null data scripts cannot be spent, so there's no scriptSig)
  


Another information (which is related to your example):


  This pattern is often used to encode data in the blockchain. After the OP_RETURN you can
  insert arbitrary data. The advantage is that the simple bitcoin nodes can prune the transaction
  saving memory, while full nodes will hold it. This is considered good behavior when
  ‘misusing’ the blockchain for storing data.


As you can see in your example there are data following the OP_RETURN so it was used to encode data into the blockchain.