f471a3be00 scripted diff: Improve invalid vout value rpc error message (Nima Yazdanmehr)
Pull request description:
Since the `vout` value can start at `0`, the error message for *negative* values can be improved to something like: `vout cannot be negative`.
ACKs for top commit:
fanquake:
ACK f471a3be00
promag:
Code review ACK f471a3be00.
Tree-SHA512: fbdee3d0ddd5b58eb93934a1217b44e125a9ad39e672b1f35c7609c6c5fcf45ae1b731d3d6135b7225d98792dbfc34a50907b8c41274a5b029d7b5c59f886560