bugfix: avoid ConfigParser error when command-line option set without config file
bugfix: avoid ConfigParser error when command-line option set without config file

sathieu/stdeb,astraw/stdeb,sathieu/stdeb,pombredanne/stdeb,benthomasson/stdeb,astraw/stdeb,benthomasson/stdeb,LeMeteore/stdeb,pombredanne/stdeb,pombredanne/stdeb,LeMeteore/stdeb,LeMeteore/stdeb,astraw/stdeb,sathieu/stdeb,benthomasson/stdeb