Comment 2 for bug 1375758

Issue is under investigation and seems related to a problem of IDs and foreign keys in the fixture we use to put the maps on during the installation process.

See:
https://github.com/gem/oq-platform/pull/168
https://github.com/gem/oq-platform/blob/master/openquakeplatform/openquakeplatform/maps_viewer/post_fixtures/ghec_map_layer.json#L21