flexchart advance error when logged out bug fix

rowers/views.py

@@ -3003,7 +3003,8 @@ def workout_flexchart3_view(request,*args,**kwargs):
         favorites = FavoriteChart.objects.filter(user=r,
                                                  workouttype__in=[workouttype,'both']).order_by("id")
         maxfav = len(favorites)-1
-    except:
+    except:
+        favorites = None
         maxfav = 0
 
     # check if favoritenr is not out of range