Unit cloning fails when the destination is a stand alone unit and has reference guides to be cloned

[vijayamanohararaj]

Issue: When a unit is cloned and the destination is a standalone unit, the cloning script fails with a null reference exception at the step of cloning reference guides.

Root cause: The cloning step assumes that the destination unit is part of a unit group. As part of cloning reference guides, the course version is accessed through the unit group, which is null in case of standalone courses.

Fix: Leverage an already existing in-built function that has logic to determine course version for both stand alone and units that are part of unit groups.

Links

JIRA: https://codedotorg.atlassian.net/browse/TEACH-1109

Testing story

Added unit tests and drone

Deployment strategy

Regular DTP

Follow-up work

None

Privacy

N/A

Security

N/A

Caching

N/A

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked