Minor fixes for loading schema data. See #1222.

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -187,6 +187,7 @@ if bpy is not None:
         for cls in reversed(classes):
             bpy.utils.unregister_class(cls)
         bpy.app.handlers.load_post.remove(prop.setDefaultProperties)
+        bpy.app.handlers.load_post.remove(prop.clearIfcStore)
         bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
         bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
         del bpy.types.Scene.BIMProperties

src/ifcblenderexport/blenderbim/bim/module/pset/data.py

@@ -149,7 +149,12 @@ class Data:
             enum_items = []
 
             if prop_template.TemplateType == "P_SINGLEVALUE":
-                data_type = str(IfcStore.get_schema().declaration_by_name(prop_template.PrimaryMeasureType or "IfcLabel"))
+                try:
+                    data_type = str(IfcStore.get_schema().declaration_by_name(prop_template.PrimaryMeasureType or "IfcLabel"))
+                except:
+                    # TODO: Occurs if the data type is something that exists in IFC4 and not in IFC2X3. To fully fix
+                    # this we need to generate the IFC2X3 pset template definitions.
+                    continue
             elif prop_template.TemplateType == "P_ENUMERATEDVALUE":
                 data_type = "enum"
                 enum_items = [v.wrappedValue for v in prop_template.Enumerators.EnumerationValues]

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -38,6 +38,7 @@ vector_styles_enum = []
 @persistent
 def clearIfcStore(scene):
     IfcStore.file = None
+    IfcStore.schema = None
 
 
 @persistent