Port: Import reports to deleted groups

[Desire456]

See cuba-platform/reports#283 and cuba-platform/reports#285

[DartVerder]

platform version: 1.1.0-SNAPSHOT

cuba-platform/reports#285 - successful ported
cuba-platform/reports#283 - failed

TC:

1. Create new project and add report add-on
2. Run application
3. Create new report group
4. Create report and set group = new group
5. Export created report
6. Create new project (or recreate DB in existing) and add report add-on
7. Run application
8. Import report -> click ok

AR:
an exception was thrown
NoResultException.txt
if you click close - file displayed as selected in "import report" window - click ok
an exception was thrown
NPE_reports.txt