bug fix

linucb/views/collect_data.py

@@ -263,6 +263,7 @@ class CollectData(object):
                             if "type" in raw_val_dict and \
                                     (raw_val_dict["type"] in ("on_click_feed_topic_card","on_click_button")):
                                 click_topic_tag_list = list()
+                                device_id = ""
                                 if "on_click_feed_topic_card" == raw_val_dict["type"]:
                                     topic_id =  raw_val_dict["params"]["topic_id"]
                                     device_id = raw_val_dict["device"]["device_id"]