Error storing stack not reflected in status

There are some things (notably creating at trust, and in future creating a stack-user project) which can fail when doing parser.Stack.store, but we currently don't catch them and store the stack anway with a failed status, so you end up with:

+--------------------------------------+------------+--------------+----------------------+
| id | stack_name | stack_status | creation_time |
+--------------------------------------+------------+--------------+----------------------+
| facd83a1-e3fc-43ea-90b4-b2e20d2a05b2 | ua1001 | _ | 2014-01-28T17:46:06Z |
| aec6a937-9f0c-42a9-ab86-a6cedd48e9ab | ua1002 | _ | 2014-01-28T17:47:03Z |
+--------------------------------------+------------+--------------+----------------------+

Which is, uh, not the most informative ;)