#4 failed to add /portal-default domain mapping in terms admin

[remi]

Problem description
----------------------
I want to reassign the /portal - default domain mapping
from APLAWS-NAV to another custom category list, say RCL.

Steps to recreate the error.
-----------------------------
1. In the terms admin, click on APLAWS Navigation List.
Then remove the domain mapping with the context set to
"Default" and application set to "/portal".

2. Then click on the other category list, say RCL and
try to add the domain mapping with the context set to
"Default" (or just leave it blank) and application set
to "/portal".

Then you will see the following error.

-*-*-*- Section: Stack trace -*-*-*-
com.redhat.persistence.FlushException: Unable to send
all events to database because these required
properties are null:
at
com.redhat.persistence.Session.flushAll(Session.java:658)
at
com.arsdigita.persistence.Session.flushAll(Session.java........

3. Other than that, you can simply start with step 2.
It will give the same error.