Fixed global empty_weight

src/endpoints/handlers/bett.py

@@ -82,6 +82,7 @@ def check_for_change():
         return
 
     global show_scale_countdown
+    global empty_weight
     latest = local_history[-1]
     if show_scale_countdown > 0 and show_scale_countdown % 3 == 0:
         show_scale(latest["total"] - empty_weight)
@@ -96,7 +97,6 @@ def check_for_change():
     weight_increased = delta > 0
 
     # Make sure there is a bed_weight
-    global empty_weight
     if empty_weight is None:
         clusters = get_clusters(
             [d["total"] for d in local_history], min_noticable_difference