Problem description: it is not possible to import a map if it contains a Host group element due to the following error:

Invalid tag "/zabbix_export/maps/map(1)/selements/selement(1)/elements/element(1)": unexpected tag "uuid".

Steps to reproduce:

1. Navigate to Monitoring => Maps
2. Create a new map
3. Open constructor for this map
4. Add a Host group element that represents "Zabbix servers" host group
5. Save the map
6. Export the map
7. Delete the map
8. Attempt to import the map

Result: Map import failed with the above error.
Expected: Map import should be successful.

Example: