Problem description: it is not possible to import a map if it contains a Host group element due to the following error:
Steps to reproduce:
- Navigate to Monitoring => Maps
- Create a new map
- Open constructor for this map
- Add a Host group element that represents "Zabbix servers" host group
- Save the map
- Export the map
- Delete the map
- Attempt to import the map
Result: Map import failed with the above error.
Expected: Map import should be successful.