`cylc vr` - WorkflowConfigError: This workflow requires an initial cycle point.

[MetRonnie]

Reproducible Example

1. Start a workflow that doesn't have flow.cylc[scheduling]initial cycle point configured using the --icp option.
2. Do cylc vr
3. Observe the following error message:

$ cylc ping wflow/run1
wflow/run1: host.example.com:1234
$ cylc validate --against-source wflow/run1
WorkflowConfigError: This workflow requires an initial cycle point.

Expected Behaviour

cylc vr uses the initial cycle point from the DB if none is provided.