nothingburger

The Japan Times, June 6の記事から引用します。

Why Toyota's so-called safety scandal is a 'nothingburger'
Unlike the Volkswagen Dieselgate scandal, there have been no recalls, and Japanese vehicles have passed retests without issues.

"nothingburger" は引用符で囲まれているので、造語、もしくは通常は余り使われない表現なのでしょう。辞書に出ているかな？

・Wiktionary: Something of less importance than its treatment suggests; also, something which is bland or unremarkable in appearance or impact.: This 2005 Donald Trump tax return is a total nothingburger.
・Urban Dictionary: something lame, dead-end, a dud, insignificant; especially something with high expectations that turns out to be average, pathetic, or overhyped.: "much to the team's dismay, the number one pick in this year's draft turned out to be a nothingburger."

世の中には、特にマスコミが騒いでいる話で、実際には大したことの無い事が往々にしてありますが、そんな時に使える便利な単語ですね。