Fix log level when verbosity option is not specified

cdist/argparse.py

@@ -21,6 +21,7 @@ parser = None
 
 _verbosity_level_off = -2
 _verbosity_level = {
+    None: logging.WARNING,
     _verbosity_level_off: logging.OFF,
     -1: logging.ERROR,
     0: logging.WARNING,

cdist/preos/debootstrap/debootstrap.py

@@ -173,7 +173,7 @@ class Debian(object):
             env = vars(args)
             new_env = {}
             for key in env:
-                if key == 'verbose':
+                if key == 'verbose' and env[key]:
                         if env[key] >= 3:
                             new_env['debug'] = "yes"
                         elif env[key] == 2: