pylint: Fix warning 'unnecessary "else" after "return"'

Recent pylint versions warn against the use of an 'else' in a
'try-except' block if using a 'return' on the 'except' part is is the
idom used by ansible-freeipa when retrieving IPA data objects.

This change removes the usage of the 'else:' in such cases, and modify
the templates so that new modules do not have the same issue in the
future.

plugins/modules/ipasudocmdgroup.py

@@ -122,8 +122,7 @@ def find_sudocmdgroup(module, name):
         _result = module.ipa_command("sudocmdgroup_show", name, args)
     except ipalib_errors.NotFound:
         return None
-    else:
-        return _result["result"]
+    return _result["result"]
 
 
 def gen_args(description, nomembers):