Treasurybases and treasury adds outputs are not spendable

[davecgh]

I noticed that most of the time dcrdata properly shows "n/a" for outputs that can't be spent. For example see a recent vote. However, it shows "false" for the treasury output of treasurybases and the treasury output of treasuryadds. It seems like those should be "n/a" too.

The outputs are never spendable directly since they only serve to increase the amount in the decentralized Treasury. Notice how treasury spends do not reference any of those outputs.