Should parentBlockID be a required field when creating an IP Block

[tylerauerbeck]

Describe the bug
When creating an initial or standalone IP Block, I receive the following error when an IP Block should't otherwise be related to any other IP Block

"Field \"CreateIPBlockInput.parentBlockID\" of required type \"ID!\" was not provided."

To my understanding, there are situations which include at a minimum creating the initial IP Block in a deployment where an IP Block may not be related to any other IP Block. The current API doesn't allow for this as it expects parentBlockID in the createIPBlock query to have a value.

To Reproduce

mutation {
  createIPBlock(input:{
    prefix: "1.2.3.4/5"
    locationID: "testloc-123456"
    ipBlockTypeID: "tstblkt-12345"
  }) {
    ip_block{
      id
      prefix
    }
  }
}

Expected behavior
An IP Block should be created by the above query

Screenshots
N/A

Additional context
N/A