Unable to delete/reopen orphan sprint

Summary:
Users are not able to reopen a sprint when its original board does not exist anymore (with or without tickets on it).

Steps to Reproduce:

1. Create a Scrum board/project
2. Start a sprint ("Sprint A")
3. Delete/Remove all tickets from this sprint
4. Delete the board/project
5. Create another board/project
6. Add this sprint into the board/project (via board filter)
7. Try to delete/reopen the sprint (via Sprint Report)

Expected Results:
The report should show-up the sprint ("Sprint A") with option to reopen it.

Actual Results:
Nothing shows up on the report related to this sprint. Even though the sprint is still available on JIRA (search issues page).

Workaround:
For JIRA Server, users can manually delete this entry from the database. For Cloud customers, please raise a support ticket with us.

• Find the sprints you have:

  select * from "AO_60DB71_SPRINT";

• Delete the sprint:

  DELETE FROM "AO_60DB71_SPRINT" where "ID" = <SPRINT-ID>;

Affects Version:
JIRA SW 7.2.0-OD-05-030
JIRA Agile v7.2.6-D20160330T044439