Unable to close sprint with sub-tasks in status unmapped on the board

Issue Summary

You can't close a sprint when it has sub-tasks in a done status category that is not mapped on the board, even if the resolution is set. The error message will be the same as if the parent task was resolved but had unresolved sub-tasks.

Steps to Reproduce

1. Create a task
2. Add some sub-tasks
3. Complete the parent task with a done status category mapped to a column on the board
4. Complete the sub-tasks with a done status category that is unmapped to a column on the board
5. Try to complete the sprint

Expected Results

The sprint is completed, and the dialogue to move incomplete issues to the next sprint is shown.

Actual Results

An error is thrown, and you can't close the sprint:

Workaround

Map all done statuses to the first column on the right side of the board.