Of all the ridiculous expressions people use - and people use a great many ridiculous expressions - one of the most ridiculous is "No need is good news." "No news is good news" simply means that if you don't hear from someone, everything is probably fine, and you can see at once why this expressions makes such little sense, because everything being fine is only one of many, many reasons why someone may not contact you. Perhaps they are tied up. Maybe they are surrounded by fierce weasels or perhaps they are wedged tightly between two refrigerators and cannot get themselves out. The expression might well be changed to "No news is bad news," except that people may not be able to contact you because they have just been crowned king or are competing in a gymnastics tournament.
The point is that there is no way to know why someone has not contacted you, until they contact you and explain themselves. For this reason, the sensible expressions would be "No news is no news," except that it is so obvious it is hardly an expression at all.