Created attachment 598892 [details]
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Description of problem:
Having error on RHSM registration with activation key brings UI of "Systems" page to onloading state forever. Further usage of Systems through UI becomes impossible. CLI also has no way to remove conflicting data info (seems manually through DB only~)

Version-Release number of selected component (if applicable):
pulp-common-1.1.11-1.el6.noarch
katello-certs-tools-1.1.6-1.git.572.1606589.el6.noarch
qpid-cpp-server-ssl-0.14-14.el6_2.x86_64
katello-glue-pulp-0.2.45-1.git.20.0d974f6.el6.noarch
katello-0.2.45-1.git.20.0d974f6.el6.noarch
katello-configure-0.2.30-1.git.16.0e273d4.el6.noarch
candlepin-tomcat6-0.5.32-1.el6.noarch
katello-qpid-client-key-pair-1.0-1.noarch
katello-cli-common-0.2.43-1.git.0.07c77a6.el6.noarch
katello-cli-0.2.43-1.git.0.07c77a6.el6.noarch
m2crypto-0.21.1.pulp-7.el6.x86_64
mod_wsgi-3.3-3.pulp.el6.x86_64
qpid-cpp-client-ssl-0.14-14.el6_2.x86_64
katello-glue-foreman-0.2.45-1.git.20.0d974f6.el6.noarch
katello-selinux-0.2.6-1.git.9.1606589.el6.noarch
katello-qpid-broker-key-pair-1.0-1.noarch
katello-agent-1.0.4-1.git.11.1606589.el6.noarch
python-qpid-0.14-7.el6_2.noarch
qpid-cpp-server-0.14-14.el6_2.x86_64
katello-glue-candlepin-0.2.45-1.git.20.0d974f6.el6.noarch
pulp-1.1.11-1.el6.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
python-oauth2-1.5.170-2.pulp.el6.noarch
candlepin-0.5.32-1.el6.noarch
qpid-cpp-client-0.14-14.el6_2.x86_64
katello-common-0.2.45-1.git.20.0d974f6.el6.noarch
katello-repos-0.2.5-1.el6.noarch
pulp-selinux-server-1.1.11-1.el6.noarch

How reproducible:
always

Steps to Reproduce:
1.prepare System Group having usage limit of 2 systems
2.create AK having no usage limit
3.assign system group to that AK.
4. register 2 systems using that activation key
5. try the third one: 
error on rhsm output:
"Validation failed: You cannot have more than 2 system(s) associated with system group 'cloud'"
Refer to the Katello UI and visit Systems-> All page.

Actual results:
Nothing but the loading progress icon is shown (attached is the pict.)

Expected results:
Katello & Candlepin both should handle the rollback of failure(s) correctly.

Additional info: