Ranking in Kanban Backlog Fails when no Columns are mapped

Problem

When attempting to rank or order issues in the Kanban backlog, it fails with an error shown on the UI.

Steps to Reproduce

• Create a Kanban Board with some issue tickets
• Configure the board and navigate to "Columns"
• Enable the backlog by adding at least 1 status to "Kanban backlog"
• Unmap all other columns. At this point, only the "Kanban backlog" will have a status mapped
  
• Attempt to rank issues.

Expected Results

Issues can be ranked just fine.

Actual results

Ranking operation fails with an error in the UI.

For 8.20+ environments, the following error is displayed in the UI instead:

Workaround

Ensure that there is at least 1 status mapped to a column.