no news is good news idiom saying
没有消息就是好消息，不闻凶讯便是吉
said to make someone feel less worried when they have not received information about someone or something, because if something bad had happened, they would have been told about it
We haven't heard anything from the hospital today, but I suppose no news is good news. 我们今天没有得到医院的任何消息，但我想没有消息就是好消息。