When the Test Issue Type has the Default (Unmapped issue types) Screens defined, the Test Case Importer gives a NullPointerException

Description
When the Test Issue Type has the Default (Unmapped issue types) Screens defined, the Test Case Importer gives a NullPointerException

Pre-conditions
Define the Test Screens as Default (Unmapped issue types)

How to reproduce
Try to import using the TCI on the misconfigured project.

Actual result/Attachments

Expected result
An error/warning is given informing the user that the Test has an incorrect Screen Scheme defined.