This March, Google experimented with search result pages that only contained the answer to the question and no links to external web pages. The zero search results pages appeared for time, calculations and conversions searches.
Google’s Danny Sullivan said on Twitter that the experiment should stop for now:
Update! We have enough data and feedback — which is appreciated — to conclude that the condensed view experiment should stop for now. The team will look at improving when and how it appears.— Danny Sullivan (@dannysullivan) 20. März 2018