file-find-project-root should throw an error if we can't find the root
file-find-project-root should throw an error if we can't find the root

Wilfred/.emacs.d,Wilfred/.emacs.d,Wilfred/.emacs.d,Wilfred/.emacs.d,Wilfred/.emacs.d,Wilfred/.emacs.d,Wilfred/.emacs.d