Description of problem:
 Listing the subscriptions to the attached distributor using cli failed

Version-Release number of selected component (if applicable):
# rpm -qa | grep katello
katello-certs-tools-1.4.2-1.el6.noarch
katello-glue-elasticsearch-1.4.3-1.el6.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
katello-cli-1.4.3-1.el6.noarch
katello-cli-common-1.4.3-1.el6.noarch
katello-glue-candlepin-1.4.3-1.el6.noarch
katello-selinux-1.4.4-1.el6.noarch
signo-katello-0.0.9-1.el6.noarch
katello-headpin-1.4.3-1.el6.noarch
katello-common-1.4.3-1.el6.noarch
katello-headpin-all-1.4.3-1.el6.noarch
katello-configure-1.4.4-1.el6.noarch
katello-repos-1.4.2-1.el6.noarch


How reproducible:
# yum install -y katello-headpin-all
# katello-configure --deployment=headpin --user-pass=***

Steps to Reproduce:
1.# headpin -u admin -p *** provider import_manifest --org ACME_Corporation --name 'Red Hat' --file '/tmp/manifest_org_sla.zip'
Provider [ Red Hat ] manifest import complete

2.# headpin -u admin -p *** distributor create --name test_dist --org ACME_Corporation

Successfully created distributor [ test_dist ]

3.]# headpin -u admin -p *** org subscriptions --name ACME_Corporation 
--------------------------------------------------------------------------------
                          Organization's Subscriptions
--------------------------------------------------------------------------------

Subscription    : High-Availability (8 sockets)
Consumed        : 0
Contract Number : None
SLA             : 
ID              : 8a90a98f40398e2d01403dfee617006a
Limits:
    [ Sockets: 8 ]
Start Date      : 2012/12/31 05:00:00
End Date        : 2013/12/31 04:59:59


Subscription    : Resilient Storage (8 sockets)
Consumed        : 0
Contract Number : None
SLA             : 
ID              : 8a90a98f40398e2d01403dfee5e2005a
Limits:
    [ Sockets: 8 ]
Start Date      : 2012/12/31 05:00:00
End Date        : 2013/12/31 04:59:59


Subscription    : Red Hat Enterprise Linux Server, Self-support (1-2 sockets) (Up to 1 guest)
Consumed        : 0
Contract Number : None
SLA             : 
ID              : 8a90a98f40398e2d01403dfee58f0048
Limits:
    [ Sockets: 2 ]
Start Date      : 2012/12/31 05:00:00
End Date        : 2013/12/31 04:59:59

#  headpin -u admin -p *** distributor subscribe --org ACME_Corporation --name test_dist --pool '8a90a98f40398e2d01403dfee58f0048'
Couldn't find system ''

# headpin -u admin -p *** distributor subscriptions --org ACME_Corporation --name test_dist
Couldn't find system ''


Actual results:
the cli command 'distributor subscriptions' failed

Expected results:
the cli command 'distributor subscriptions' successful

Additional info: