Description of problem:
As subject says, when trying to add a duplicate class in a namespace, the flash message is not shown. However the duplicate class is not created, which makes it just a consmetic error.

Version-Release number of selected component (if applicable):
5.8.1.2

How reproducible:
always

Steps to Reproduce:
1. Create an automate namespace
2. Create a class (let's say "cls1")
3. Try creating a new class with the same name in the namespace

Actual results:
Class is not created, flash message not shown.

Expected results:
Class is not created, flash message is shown.

Additional info: