Description of problem:
Domain is successfully destroyed with a wrong namespace parameter.

Version-Release number of selected component (if applicable):
rhc-0.89.7-1.el6_2.noarch

How reproducible:
Always

Steps to Reproduce:
1.Create domain
$ rhc domain create -n <domain_name> -l <user_email>
2.Destroy domain with a wrong namespace parameter
$ rhc domain destroy -n <invalid_domain_name> -l <user_email>
3.
  
Actual results:
Domain is destroyed successfully.
<------------output-------------->
[root@guest ~]# rhc domain destroy -l jizhao+2 -d -n jizhao
Password: 
Submitting form:
namespace: jizhao
delete: true
rhlogin: jizhao+2
Contacting https://ec2-23-20-152-133.compute-1.amazonaws.com
Response from server:
DEBUG:


Exit Code: 0
api_c: placeholder
broker_c: namespacerhloginsshapp_uuiddebugaltercartridgecart_typeactionapp_nameapi
API version:    1.1.3
Success
<-------------------------------->

Expected results:
Domain shouldn't be destroyed. The client should prompt something like "invalid domain name" or so.

Additional info: