[Bug] `graphman chain info` fails

[lutter]

Bug report

With recent graph-node master, this command fails with a complaint about parentHash:

# graphman chain info mainnet
Error: missing field `parentHash`

Relevant log output

No response

IPFS hash

No response

Subgraph name or link to explorer

No response

Some information to help us out

• [ ] Tick this box if this bug is caused by a regression found in the latest release.
• [ ] Tick this box if this bug is specific to the hosted service.
• [X] I have searched the issue tracker to make sure this issue is not a duplicate.

OS information

None