fix issue with court name

tournaments/models/club.py

@@ -26,6 +26,6 @@ class Club(models.Model):
 
     def court_name(self, index):
         for court in self.court_set.all():
-            if court.index == index and court.name:
+            if court.index == index and court.name is not None and len(court.name) > 0:
                 return court.name
-        return f"Terrain {index}"
+        return f"Terrain {index + 1}"

tournaments/models/court.py

@@ -14,4 +14,4 @@ class Court(models.Model):
         if self.name:
             return self.name
         else:
-            return f"Terrain {self.index}"
+            return f"Terrain {self.index + 1}"