Fix error message when renaming a group using a name that already exists

From: Gagné Sébastien <sebastien.gagne.2@umontreal.ca>
Date: Mon, 12 Nov 2012 11:07:53 -0500
To: <grouper-users@internet2.edu>
Subject: [grouper-users] Exception when groups have the same name

Hi,
Testing the Grouper Admin UI, I found that if I try to create a group with the same name as one in the current stem I get a proper error message :

But if I try to modify/rename a group to one that has the same name in the same stem, I get an Exception in the logs with the generic system error message (Error was logged and admin was notified, please contact technical support) :

Is it possible to have a more explicit error message in that case ? Like the one we get at creation