Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1133792
Description of problem:
API for user creation fails with: {"message":"undefined method `key?' for #<JSON::Ext::Generator::State:0x0000000b3fd378>"}
but the user gets created!

Version-Release number of selected component (if applicable):
Satellite-6.0.4-RHEL-6-20140823.0-Satellite-x86_64

How reproducible:
always

Steps to Reproduce:

1. curl "$(hostname)/api/users" -u admin:changeme -H "Accept: application/json" -H "Content-Type: application/json" -d '{"user":{"login":"another","mail":"root@localhost","auth_source_id":1,"password":"another_gfolvwxr"}}'

Actual results: {"message":"undefined method `key?' for #<JSON::Ext::Generator::State:0x0000000b3fd378>"}

Additionally the user was created, even if an exception was thrown.

• no error && user gets created
  or
• error && do not create the user