command: make sure that all _handle_aliases() calls returns {}

module_common: also work if there are no aliases (shell, command, etc) modules

lib/ansible/module_common.py

@@ -592,10 +592,8 @@ class AnsibleModule(object):
         passwd_keys = ['password', 'login_password']
         
         for param in self.params:
-            no_log = False
-            if self.aliases:
             canon  = self.aliases.get(param, param)
-                arg_opts = self.argument_spec[canon]
+            arg_opts = self.argument_spec.get(canon, {})
             no_log = arg_opts.get('no_log', False)
                 
             if no_log:

library/command

@@ -129,7 +129,7 @@ def main():
 class CommandModule(AnsibleModule):
 
     def _handle_aliases(self):
-        pass
+        return {}
 
     def _check_invalid_arguments(self):
         pass