Description of problem:
on RHEL7 iso and rhui-installer-0.0.24-1.el7ui.noarch 

On first login into rhui-manager

>> rhui-manager
Previous authentication credentials could not be found. Logging into
the RHUI.

If this is the first time using the RHUI, it is recommended to change
the user's password in the User Management section of RHUI Tools.

RHUI Username: admin
RHUI Password: 

RequestException: POST request on /pulp/api/v2/actions/login/ failed with 401 - Authentication with username admin failed: invalid username or password
Traceback (most recent call last):
  File "/bin/rhui-manager", line 16, in <module>
    rhui.tools.launcher.main()
  File "/usr/lib/python2.7/site-packages/rhui/tools/launcher.py", line 313, in main
    shell = RhuiShell(config, prompt, pulp_api, cdn_api, certificate_manager)
UnboundLocalError: local variable 'pulp_api' referenced before assignment


Changed the pass of admin and tried to login with wrong one

>> rhui-manager --username admin --password 654321
RequestException: POST request on /pulp/api/v2/actions/login/ failed with 401 - Authentication with username admin failed: invalid username or password
Traceback (most recent call last):
  File "/bin/rhui-manager", line 16, in <module>
    rhui.tools.launcher.main()
  File "/usr/lib/python2.7/site-packages/rhui/tools/launcher.py", line 313, in main
    shell = RhuiShell(config, prompt, pulp_api, cdn_api, certificate_manager)
UnboundLocalError: local variable 'pulp_api' referenced before assignment


How reproducible:
always

Steps to Reproduce:
1. use wrong pass when login into rhui-manager

Actual results:
Error msg + traceback


Expected results:
only Error msg