(Bloomberg) -- One of FAT Brands Inc.’s shareholders is suing the restaurant-chain owner for allegedly hiding the true extent of its debt amid a darkening financial outlook that saw its stock hit a multiyear low this week.The company, which owns Fatburger and Johnny Rockets, resorted to high-interest loans known as merchant cash advances as its finances deteriorated, according to a pair of complaints filed in Delaware Chancery Court since late November. The shareholder accuses FAT Brands of misrepresenting ...