steemtail's output always returns zeroes for trx_id

[sneak]

e.g.

{
  "trx_id": "0000000000000000000000000000000000000000",
  "block": 19348545,
  "trx_in_block": 45,
  "op_in_trx": 1,
  "virtual_op": 0,
  "timestamp": "2018-01-27T15:43:42",
  "op": [
    "producer_reward",
    {
      "producer": "pharesim",
      "vesting_shares": "390.877162 VESTS"
    }
  ]
}

the trx_id is always all zeroes when running steemtail.