Fix getting config from git config

Currently the CLI will store to the Config object
values from the argument parsing regardless of
whether they are None or not.

But if config.xxx is created, even with a None value
the __getattr__ will never get called and thus will
never lookup the git config value.

The fix is to only store non-None values from the
argument parsing to the Config object.

Author: fallen

git_pw/shell.py

@@ -97,12 +97,18 @@ def cli(
     """
     logger.configure_verbosity(debug)
 
-    CONF.debug = debug
-    CONF.token = token
-    CONF.username = username
-    CONF.password = password
-    CONF.server = server
-    CONF.project = project
+    if debug:
+        CONF.debug = debug
+    if token:
+        CONF.token = token
+    if username:
+        CONF.username = username
+    if password:
+        CONF.password = password
+    if server:
+        CONF.server = server
+    if project:
+        CONF.project = project
 
 
 @cli.group()