campaign detail view display None as - with gray background

app/campaign/templatetags/filters.py

@@ -14,5 +14,5 @@ def at(l, id):
 @register.filter
 def to_rgb(tup):
     if tup is None:
-        return  '80, 80, 80'
+        return  '100, 100, 100'
     return ','.join([str(x) for x in tup])

app/campaign/views.py

@@ -74,7 +74,14 @@ def get_context_data(self, **kwargs):
         room_current_values = {}
         for room in campaign.rooms.all():
             room_current_values[room.pk] = room_calculate_current_values(room)
-
+
+            print(room_current_values[room.pk])
+            # for better dispaying set alle values that are None to '- '
+            for i in range(0, len(room_current_values[room.pk]), 2):
+                if room_current_values[room.pk][i] is None:
+                    room_current_values[room.pk][i] = '- '
+            print(room_current_values[room.pk])
+
         context['room_current_values'] = room_current_values
 
         return context

app/main/util.py

@@ -115,7 +115,7 @@ def get_current_mean(dimension):
         current_tvoc = get_current_mean(Dimension.TVOC)
         tvoc_color = Dimension.get_color(Dimension.TVOC, current_tvoc) if current_tvoc else None
 
-        return (
+        return [
             current_temperature, 
             temperature_color,
             current_pm2_5, 
@@ -124,4 +124,4 @@ def get_current_mean(dimension):
             co2_color,
             current_tvoc,
             tvoc_color
-        )
+        ]