Incorrect block state hash for genesis blocks

The node version 1.1.2 has an incorrect response for the GetBlockInfo query for genesis blocks.
In particular the stateHash will be reported as 0000000000000000000000000000000000000000000000000000000000000000 which is incorrect.

This is only an error in the reporting. Internally the node will use the correct state hash.

See https://github.com/Concordium/concordium-node/issues/147 for details.