PR12278 backport https://github.com/bitcoin/bitcoin/pull/12278/files
ee11121 Add special error for genesis coinbase to gettransaction (MeshCollider)
Pull request description:
Suggested by sipa here: https://botbot.me/freenode/bitcoin-core-dev/2018-01-23/?msg=96069825&page=2 Just adds a special error message for the genesis block coinbase transaction when using `getrawtransaction`