statefulMapController.fromGeoJson fails to add geometries if they don't have names.

[jipiloub]

Current behavior
Given a geometry without name was added to the statefulMapController with its fromGeoJson function,
When adding another geometry,
Then the first geometry is erased.

Expected behavior
The name of the geometry is somehow required. E.g. the function throws an Exception if the name is not defined.

Names in GeoJson
I'm not expert. Here are my findings.

This is a geometry without name:

{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"coordinates":[[[2.6716218646834,42.725850866641956],[2.6716723333868613,42.7251191289365], [2.7276823314798353,42.98550138640216],[2.715923326897498,42.985579790834805]]],"type":"Polygon"},"properties":{"name":"Corbières Fenouillèdes"}}]}

To add a name, adding "name": "My geometry" in properties worked for me.