fixed bug with wall attributes cleaning

backend/Property.py

@@ -614,6 +614,9 @@ class Property:
                 # Handling edge case for walls
                 fill_with = False if description == "walls-description" else None
                 fill_dict = dict(zip(template.keys(), [fill_with] * len(template)))
+                if description == "walls-description":
+                    fill_dict["thermal_transmittance_unit"] = None
+                    fill_dict["insulation_thickness"] = "none"
 
                 fill_dict.update(
                     {

etl/epc_clean/epc_attributes/WallAttributes.py

@@ -148,6 +148,9 @@ class WallAttributes(Definitions):
             for key in self.DEFAULT_KEYS:
                 result[key] = False
 
+            result["thermal_transmittance_unit"] = None
+            result["insulation_thickness"] = "none"
+
             return result
 
         description = self.description.lower()