Fix #4867. Accommmodate invalid IFC data from 12D.

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -526,6 +526,8 @@ class IfcImporter:
                     if representation_id is None:
                         representation_id = rep.id()
                 rep = rep.Items[0].MappingSource.MappedRepresentation
+                if not rep: # Accommodate invalid files
+                    return False
             else:
                 if representation_id is None:
                     representation_id = rep.id()

src/blenderbim/blenderbim/tool/spatial.py

@@ -255,6 +255,8 @@ class Spatial(blenderbim.core.tool.Spatial):
 
     @classmethod
     def import_spatial_element(cls, element, level_index):
+        if not element.is_a("IfcProject") and not tool.Root.is_spatial_element(element):
+            return
         props = bpy.context.scene.BIMSpatialDecompositionProperties
         new = props.containers.add()
         new.ifc_class = element.is_a()