Allow to configure protocol to False

review267001
(transplanted from 06e7461d2f3a55e5d44f61512ac40cf3aa874890)

trytond/config.py

@@ -104,7 +104,7 @@ class ConfigManager(object):
                 value = True
             if value == 'False' or value == 'false':
                 value = False
-            if name in ('xmlrpc', 'jsonrpc', 'webdav'):
+            if name in ('xmlrpc', 'jsonrpc', 'webdav') and value:
                 value = [(get_hostname(netloc).replace('*', ''),
                     get_port(netloc, name)) for netloc in value.split(',')]
             self.options[name] = value