[MIRA] SWT exception if a referred document is absent
- create an AF3 project
- create a requirement with reference to an external document
- quit AF3
- navigate to the file corresponding to the project
- copy the file (and the referred document) somewhere else
- delete it
- reopen AF3
- import the project from where you copied it
- open the requirement with the reference
- observe an SWT exception
(from redmine: issue id 2758, created on 2016-11-29, closed on 2018-02-22)