fixing Sunday display on calendar

core/models/survex.py

@@ -148,10 +148,11 @@ class SurvexBlock(models.Model):
     def DayIndex(self):
         """This is used to set different colours for the different trips on
         the calendar view of the expedition"""
+        mx = 10
         index = list(SurvexBlock.objects.filter(date=self.date)).index(self)
-        if index not in range(0,10):
-            print(f"Unexpected SurvexBlock DayIndex '{index}' {self}")
-            index = 10
+        if index not in range(0, mx):
+            print(f"DayIndex: More than {mx-1} SurvexBlock items on one day '{index}' {self}")
+            index = 0
         #return list(self.survexblock_set.all()).index(self)
         return index