avoid even more invalid enum warnings...

warnings like `pyrna_enum_to_py: current value '17' matches no enum in 'BIMModelProperties', '', 'relating_type_id'`

src/blenderbim/blenderbim/bim/module/model/data.py

@@ -53,7 +53,7 @@ class AuthoringData:
         cls.data["ifc_element_type"] = cls.ifc_element_type
         cls.data["ifc_classes"] = cls.ifc_classes()
         cls.data["relating_type_id"] = cls.relating_type_id()  # only after .ifc_classes()
-        cls.data["predefined_type"] = cls.predefined_type()
+        cls.data["predefined_type"] = cls.predefined_type() # only after .relating_type_id()
         cls.data["type_class"] = cls.type_class()
 
         # only after .type_class()
@@ -251,6 +251,8 @@ class AuthoringData:
 
     @classmethod
     def predefined_type(cls):
+        if not tool.Blender.enum_property_has_valid_index(cls.props, "relating_type_id", cls.data["relating_type_id"]):
+            return
         relating_type_id = cls.props.relating_type_id
         if not relating_type_id:
             return

src/blenderbim/blenderbim/tool/blender.py

@@ -472,11 +472,16 @@ class Blender(blenderbim.core.tool.Blender):
         """method created for readibility and to avoid console warnings like
         `pyrna_enum_to_py: current value '17' matches no enum in 'BIMModelProperties', '', 'relating_type_id'`
         """
+        items_amount = len(enum_items)
+        # If enum has no items it seems to always produce a warning.
+        # E.g. if you try to get it's value directly: `BIMModelProperties.relating_type_id`.
+        if items_amount == 0:
+            return False
         current_value_index = props.get(prop_name, None)
         # assuming the default value is fine
         if current_value_index is None:
             return True
-        return current_value_index < len(enum_items)
+        return current_value_index < items_amount
 
     @classmethod
     def append_data_block(cls, filepath: str, data_block_type: str, name: str, link=False, relative=False) -> dict: