Fixed keyerror

mopidy_touchscreen/screen_objects.py

@@ -26,8 +26,10 @@ class ScreenObjectsManager():
         self.text_objects = {}
 
     def set_object(self, key, add_object):
-	if self.text_objects[key] is not None:
+	try:
 	    self.dirty_area.append(self.text_objects[key].rect_in_pos)
+	except KeyError:
+	    pass
         self.text_objects[key] = add_object
 	self.dirty_area.append(add_object.rect_in_pos)