If the $WA_USER_DIRECTORY folder is not present on the users
system it is automatically created and a default config.py file
created. Previously this newly created file would not be loaded into
WA causing it to crash.
If the environment variable $WA_USER_DIRECTORY is not set `_env_root`
is automatically generated from the path expansion of `~`. In some cases
if a home directory is not avaliable for the user this may result in an empty
string. This commit ensure that '_env_root' is still an absolute path
using the current working directory.
