Bug 1391511

Description of problem:
Sometimes the Web-UI does strange things. I'm testing a machine and due to
FAIL in the results I try to repeat the test several times. But then, suddenly after the test was finished, I don't see the "Continue Testing" button but I see a "Create new test run" button instead. If I click on that a results file with status "new" will be added and then I see this "Create new test run" button again.



Version-Release number of selected component (if applicable):
4.0

How reproducible:
Sporadically

Steps to Reproduce:
1. Do the same test several times again
2.
3.

Actual results:
Suddenly instead of "Continue testing" the "Create new test run" button appears and you're in a loop, creating lots of new test runs. 

Expected results:
Can alyways continue testing.

Additional info:
Those extra empty result files seem also to affect the Web-UI. In some cases I see a "Continue testing" button, but if I press it all I get is an error message with this traceback from Python:

--------------8<-snip-----------------
Environment:


Request Method: POST
Request URL: http://192.168.2.3/certification/hardware/42/192.168.2.138/2016-11-03%2008:07:49/testing/

Django Version: 1.8.4
Python Version: 2.7.5
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.messages',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.staticfiles',
 'application')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Traceback:
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/var/www/rhcert/application/views.py" in activity_testing
  132.     return Testing().serve(request, 'activity-testing.html', program, certID, host, time)
File "/var/www/rhcert/wsgi/testing.py" in serve
  31.         return Certification.serve(self, request, template, program, certID)
File "/var/www/rhcert/wsgi/certification.py" in serve
  38.         return Product.serve(self, request, template, vendorID, productID)
File "/var/www/rhcert/wsgi/product.py" in serve
  27.         return View.serve(self, request, template)
File "/var/www/rhcert/wsgi/view.py" in serve
  51.         result = self.view(request)
File "/var/www/rhcert/wsgi/testing.py" in view
  46.         self.initializeView(request)
File "/var/www/rhcert/wsgi/testing.py" in initializeView
  43.         self.testHost = Host(self.resultsDocument.getOS(Tags.hostname), ipAddress=self.resultsDocument.getOS(Tags.ip_address))

Exception Type: AttributeError at /certification/hardware/42/192.168.2.138/2016-11-03 08:07:49/testing/
Exception Value: 'NoneType' object has no attribute 'getOS'
--------------8<-snip-----------------

This problem disappears when I delete the "empty" test results file.