bugfix: check if login config was created before using it
bugfix: check if login config was created before using it

* inform the user if the file was not created
* adjust file attributes if it was created successfully

Signed-off-by: Dominik Richter <b7323add517e187efe0283b76511b7ed762bfe13@gmail.com>

nofxx/git-issues,gittalk/git-issues