Make sure we don't redefine CoreException.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3833 a333f486-631f-4898-b8df-5754b55c2be0

core/oql/check_oql.php

@@ -20,9 +20,12 @@
  *     echo "Ok, '$sOQL' is a valid query";
  * }
  */
-class CoreException extends Exception
+if (!class_exists('CoreException', false))
 {
-
+	class CoreException extends Exception
+	{
+	
+	}
 }
 
 require_once(__DIR__.'/expression.class.inc.php');