minor fixes to constants

lib/ansible/constants.py

@@ -194,7 +194,7 @@ DEPRECATION_WARNINGS           = get_config(p, DEFAULTS, 'deprecation_warnings',
 DEFAULT_CALLABLE_WHITELIST     = get_config(p, DEFAULTS, 'callable_whitelist', 'ANSIBLE_CALLABLE_WHITELIST', [], islist=True)
 COMMAND_WARNINGS               = get_config(p, DEFAULTS, 'command_warnings', 'ANSIBLE_COMMAND_WARNINGS', False, boolean=True)
 DEFAULT_LOAD_CALLBACK_PLUGINS  = get_config(p, DEFAULTS, 'bin_ansible_callbacks', 'ANSIBLE_LOAD_CALLBACK_PLUGINS', False, boolean=True)
-DEFAULT_CALLBACK_WHITELIST     = get_config(p, DEFAULTS, 'callback_whitelist', 'ANSIBLE_CALLBACK_WHITELIST', None, islist=True)
+DEFAULT_CALLBACK_WHITELIST     = get_config(p, DEFAULTS, 'callback_whitelist', 'ANSIBLE_CALLBACK_WHITELIST', [], islist=True)
 RETRY_FILES_ENABLED            = get_config(p, DEFAULTS, 'retry_files_enabled', 'ANSIBLE_RETRY_FILES_ENABLED', True, boolean=True)
 RETRY_FILES_SAVE_PATH          = get_config(p, DEFAULTS, 'retry_files_save_path', 'ANSIBLE_RETRY_FILES_SAVE_PATH', '~/')
 
@@ -220,7 +220,7 @@ PARAMIKO_PTY                   = get_config(p, 'paramiko_connection', 'pty', 'AN
 # galaxy related
 DEFAULT_GALAXY_URI             = get_config(p, 'galaxy', 'server_uri', 'ANSIBLE_GALAXY_SERVER_URI', 'https://galaxy.ansible.com')
 # this can be configured to blacklist SCMS but cannot add new ones unless the code is also updated
-GALAXY_SCMS                    = get_config(p, 'galaxy', 'scms', 'ANSIBLE_GALAXY_SCMS', ['git','hg'], islist=True)
+GALAXY_SCMS                    = get_config(p, 'galaxy', 'scms', 'ANSIBLE_GALAXY_SCMS', 'git, hg', islist=True)
 
 # characters included in auto-generated passwords
 DEFAULT_PASSWORD_CHARS = ascii_letters + digits + ".,:-_"