domain relations causes exception

[m-kuhn]

When creating a new schema from the model KbS_LV95_V1_3 (from the official repository), I get the following trace:

Traceback (most recent call last):
  File "/home/mku/.local/share/QGIS/QGIS3/profiles/default/python/plugins/projectgenerator/gui/generate_project.py", line 154, in accepted
    relations = generator.relations(available_layers)
  File "/home/mku/.local/share/QGIS/QGIS3/profiles/default/python/plugins/projectgenerator/libqgsprojectgen/generator/postgres/postgrescreator.py", line 200, in relations
    domain_relations = domainRelation.find_domain_relations(layers, self.conn, self.schema, self.inheritance)
  File "/home/mku/.local/share/QGIS/QGIS3/profiles/default/python/plugins/projectgenerator/libqgsprojectgen/generator/postgres/domain_relations.py", line 135, in find_domain_relations
    attrs_ili_pg_owner[classes_ili_pg[iliclass]][iliattr],
KeyError: 'KbS_LV95_V1_3.Belastete_Standorte.Belasteter_Standort.Deponietyp'

Some debug output has been added in 9a5b6ec

@gacarrillor does that ring a bell?