Update git_pw/shell.py

Co-authored-by: Stephen Finucane <stephenfinucane@hotmail.com>

Author: fallen

git_pw/shell.py

@@ -97,17 +97,17 @@ def cli(
     """
     logger.configure_verbosity(debug)
 
-    if debug:
+    if debug is not None:
         CONF.debug = debug
-    if token:
+    if token is not None:
         CONF.token = token
-    if username:
+    if username is not None:
         CONF.username = username
-    if password:
+    if password is not None:
         CONF.password = password
-    if server:
+    if server is not None:
         CONF.server = server
-    if project:
+    if project is not None:
         CONF.project = project