"Nothingburger" is a term of art used to indicate a non-story, an empty claim. Such a claim is made in the San Francisco Chronicle, and someone thought enough of it to list it on this afternoon's RealClearPolitics list.
The article is mis-titled "Jeff Sessions suit against California is bad news for Republicans." Once beyond the title you discover the suit might be bad news for CA Republicans who are, as my late father pungently observed, roughly as irrelevant as "tits on a boar." No Republican has a realistic chance at state-wide office in CA's one-party slough of despond.
It could possibly make reelection more difficult for the 14 (of 53) CA Congressional seats currently held by Republicans. I wouldn't even be certain of that; some seats like the one I once called home in far northern CA are red as a beet. Increased Hispanic turnout wouldn't have much impact there.
Nationwide, Sessions' lawsuit will be viewed as a distinct plus by Trump voters who want the wall built, illegal immigration reined in and sanctuary mayors arrested.
If Californians in blue districts don't like the suit, so what? So the Democrat in the district wins 65% of the vote instead of 60% ... either way it's a win, running up your total in districts you already control accomplishes little as Hillary discovered.