make out of nothing
make something out of nothing
1. Lit. to create something of value from nearly worthless parts. My uncle—he sells sand—made a fortune out of nothing. My model airplane won the contest even though I made it out of scrap.
2. Fig. to make an issue of something of little importance. Relax, John, you're making a big problem out of nothing. You have no evidence. You're making a case out of nothing.