Teach the common module code to warn users about typo'd arguments and also set everything to None automatically such

that code doesn't have to do a lot of params.get('foo', None) everywhere.

command

@@ -76,6 +76,12 @@ def main():
 
 class CommandModule(AnsibleModule):
 
+    def _handle_aliases(self):
+        pass
+
+    def _check_invalid_arguments(self):
+        pass
+
     def _load_params(self):
         ''' read the input and return a dictionary and the arguments string '''
         args = base64.b64decode(MODULE_ARGS)

yum

@@ -280,15 +280,13 @@ def main():
             # removed==absent, installed==present, these are accepted as aliases
             state=dict(default='installed', choices=['absent','present','installed','removed','latest']),
             list=dict(choices=['installed','updates','available','repos','pkgspec']),
+            conf_file=dict()
         )
     )
 
     params = module.params
 
-    if 'conf_file' not in params:
-        params['conf_file'] = None
-
-    if 'list' in params and 'pkg' in params:
+    if params['list'] and params['pkg']:
         module.fail_json(msg="expected 'list=' or 'name=', but not both")
     
     if 'list' in params: