Add return type to highlight three-valued logic

data/models/diagnostic.py

@@ -1654,7 +1654,7 @@ def total_family_autres(self):
         return self.family_sum("autres")
 
     @property
-    def appro_badge(self):
+    def appro_badge(self) -> bool | None:
         total = self.value_total_ht
         if total:
             bio_share = (self.value_bio_ht or 0) / total
@@ -1689,15 +1689,15 @@ def appro_badge(self):
             return False
 
     @property
-    def waste_badge(self):
+    def waste_badge(self) -> bool | None:
         if self.has_waste_diagnostic and self.waste_actions and len(self.waste_actions) > 0:
             if self.has_donation_agreement or (self.canteen.daily_meal_count and self.canteen.daily_meal_count < 3000):
                 return True
         if self.tunnel_waste:
             return False
 
     @property
-    def diversification_badge(self):
+    def diversification_badge(self) -> bool | None:
         if self.vegetarian_weekly_recurrence == Diagnostic.MenuFrequency.DAILY:
             return True
         elif self.vegetarian_weekly_recurrence in [Diagnostic.MenuFrequency.MID, Diagnostic.MenuFrequency.HIGH]:
@@ -1708,7 +1708,7 @@ def diversification_badge(self):
             return False
 
     @property
-    def plastic_badge(self):
+    def plastic_badge(self) -> bool | None:
         if (
             self.cooking_plastic_substituted
             and self.serving_plastic_substituted
@@ -1720,7 +1720,7 @@ def plastic_badge(self):
             return False
 
     @property
-    def info_badge(self):
+    def info_badge(self) -> bool | None:
         if self.communicates_on_food_quality:
             return True
         if self.tunnel_info: