Description of problem:
destroy domain with non-exist name will get exit code 0,

Version-Release number of selected component (if applicable):
devenv_1761

How reproducible:
always

Steps to Reproduce:
1.create domain 
rhc domain create -n testdomain
2.destroy domain with non-existed name
rhc domain destroy -n testdomainnew
  
Actual results:
exit code 0 returned, and domain did not be destroyed.

Expected results:
other exit code returned.

Additional info:
[root@localhost openshift]# rhc domain destroy -n ttt -d
Password: 
Submitting form:
namespace: ttt
delete: true
rhlogin: bmeng+auto2@redhat.com
Contacting https://ec2-23-21-35-107.compute-1.amazonaws.com
Problem reported from server. Response code was 400.

DEBUG:


Exit Code: 0
broker_c: namespacerhloginsshapp_uuiddebugaltercartridgecart_typeactionapp_nameapi
api_c: placeholder
API version:    1.1.3

RESULT:
Cannot alter or remove namespace ttt. Namespace does not exist.