Empty reply will break chatbot

[MrOrz]

View details in Rollbar: https://rollbar.com/mrorz/rumors-line-bot/items/364/

[LINE Client] 400: A message (messages[2]) in the request body is invalid.

messages[2]:

{"type":"flex","altText":"請從下列選擇您要查看的回應。","contents":{"type":"carousel","contents":[{"type":"bubble","direction":"ltr","header":{"type":"box","layout":"horizontal","spacing":"md","paddingBottom":"none","contents":[{"type":"text","text":"💬","flex":0},{"type":"text","text":"有人認為它含有不實訊息","gravity":"center","size":"sm","weight":"bold","wrap":true,"color":"#AAAAAA"}]},"body":{"type":"box","layout":"vertical","contents":[{"type":"text","text":"假的。 \n2019年起的相關規定如下：\n1、紅燈右轉: 機車和小型車罰 600元、大型車罰1400元。\n2、闖紅燈: 機車罰1800元、小型車罰2700元、大型車罰3600元。","align":"start","wrap":true,"margin":"md","maxLines":10},{"type":"filler"},{"type":"separator","margin":"md"},{"type":"box","layout":"horizontal","contents":[{"type":"text","text":"👍 有 1296 人覺得此回應有幫助\n😕 有 14 人覺得此回應沒幫助","size":"xs","wrap":true}],"margin":"md","spacing":"none"}]},"footer":{"type":"box","layout":"vertical","contents":[{"type":"button","action":{"type":"postback","label":"👀 看他怎麼說","displayText":"我要選「假的。 \n2019年起的相關規定如下：\n1、紅⋯⋯」","data":"{\"input\":\"CkyiZ24BV0DITCqGleU_\",\"sessionId\":1630504342376,\"state\":\"CHOOSING_REPLY\"}"},"style":"primary","color":"#ffb600"}]}},{"type":"bubble","direction":"ltr","header":{"type":"box","layout":"horizontal","spacing":"md","paddingBottom":"none","contents":[{"type":"text","text":"💬","flex":0},{"type":"text","text":"有人認為它不在查證範圍","gravity":"center","size":"sm","weight":"bold","wrap":true,"color":"#AAAAAA"}]},"body":{"type":"box","layout":"vertical","contents":[{"type":"text","text":"","align":"start","wrap":true,"margin":"md","maxLines":10},{"type":"filler"},{"type":"separator","margin":"md"},{"type":"box","layout":"horizontal","contents":[{"type":"text","text":"還沒有人針對此回應評價","size":"xs","wrap":true}],"margin":"md","spacing":"none"}]},"footer":{"type":"box","layout":"vertical","contents":[{"type":"button","action":{"type":"postback","label":"👀 看他怎麼說","displayText":"我要選「」","data":"{\"input\":\"UkJBtHoBgBgcuemX5aeB\",\"sessionId\":123,\"state\":\"CHOOSING_REPLY\"}"},"style":"primary","color":"#ffb600"}]}}]}}

The reply: https://cofacts.tw/reply/UkJBtHoBgBgcuemX5aeB

Occurrences: