GraphQL blocks pagination on stake pool not working as expected

[lewnelson]

Pagination on the blocks returned from stake pools in GraphQL aren't working as expected. When querying with the (last:10) parameters only 9 blocks are being returned. However when querying with (before:"n", last:10), 10 blocks are returned. This is true for stake pools with 10 or more blocks.

Mandatory Information

1. jcli --full-version - jcli 0.7.2 (HEAD-b5df0e0, release, macos [x86_64]) - [rustc 1.39.0 (4560ea788 2019-11-04)]
2. jormungandr --full-version - jormungandr 0.7.2 (HEAD-b5df0e0, release, macos [x86_64]) - [rustc 1.39.0 (4560ea788 2019-11-04)]

To Reproduce
Steps to reproduce the behavior:

Query which fails to return 10 blocks (note this stake pool contains "721" blocks). Only the latest 9 blocks are being returned. (effectively page 1)

{
  stakePool(id: "3054189da4f1b98546c75a28e1f5f4b7f3d96a5656cf1092eb6f41bfd01d1097") {
    blocks(last: 10) {
      pageInfo {
        hasNextPage
        hasPreviousPage
        startCursor
        endCursor
      }
      totalCount
      edges {
        cursor
        node {
          id
        }
      }
    }
  }
}

This query returns 10 blocks. (effectively page 2)

{
  stakePool(id: "3054189da4f1b98546c75a28e1f5f4b7f3d96a5656cf1092eb6f41bfd01d1097") {
    blocks(last: 10, before:"711") {
      pageInfo {
        hasNextPage
        hasPreviousPage
        startCursor
        endCursor
      }
      totalCount
      edges {
        cursor
        node {
          id
        }
      }
    }
  }
}

Expected behavior
Expecting 10 blocks to return when asked for 10 blocks and the stake pool contains at least 10 blocks.

Additional context
Add any other context about the problem here.