handling missing roof description

recommendations/RoofRecommendations.py

@@ -300,6 +300,10 @@ class RoofRecommendations:
         ):
             return False
 
+        if self.property.roof["original_description"] is None:
+            # There is no description so we cannot make an assessment
+            return False
+
         return True
 
     @staticmethod

recommendations/tests/test_roof_recommendations.py

@@ -8,6 +8,30 @@ from recommendations.tests.test_data.materials import materials
 
 class TestRoofRecommendations:
 
+    def test_null_roof_description(self):
+        epc_record = EPCRecord()
+        epc_record.prepared_epc = {
+            "county": "Cambridgeshire",
+        }
+        property_instance = Property(id=0, address="fake", postcode="fake", epc_record=epc_record)
+        property_instance.age_band = "F"
+        property_instance.insulation_floor_area = 100
+        property_instance.roof = {
+            'original_description': None,
+            'clean_description': None,
+            'thermal_transmittance': None,
+            'thermal_transmittance_unit': None,
+            'is_pitched': True, 'is_roof_room': False, 'is_loft': False, 'is_flat': False, 'is_thatched': False,
+            'is_at_rafters': False, 'is_assumed': True, 'has_dwelling_above': False, 'is_valid': True,
+            'insulation_thickness': 'none', 'roof_thermal_transmittance': None, 'roof_insulation_thickness': None
+        }
+        property_instance.already_installed = []
+
+        roof_recommender = RoofRecommendations(property_instance=property_instance, materials=materials)
+        roof_recommender.recommend(phase=0)
+
+        assert not roof_recommender.recommendations
+
     def test_loft_insulation_recommendation_no_insulation(self):
         epc_record = EPCRecord()
         epc_record.prepared_epc = {