fixing pyflakes crash if default-directory has changed
fixing pyflakes crash if default-directory has changed

pull request to upstream: https://github.com/purcell/flymake-python-pyflakes/pull/1

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