Running the dvd test from the command line throws a TypeError.

redhat-certification-1.0-20150813.el6
redhat-certification-hardware-1.6.6-20150817.el6

reliably reproduced with no workarounds yet known

Steps to Reproduce:
1. run rhcert-backend plan
2. run rhcert-backend run -t dvd
3.

Actual results:
TypeError and traceback

Expected results:
no error, dvd test runs to completion

Additional info:
Running dvd on device=sr0 udi=/devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 

  Your device /dev/sr0 supports dvd-rw, dvd+rw, dvd-r, dvd+r, dvd 

Would you like to test dvd-rw media? (yes|no) no
response: no
response: False
Please choose the media to be tested: dvd-r
response: dvd-r
Traceback (most recent call last):
  File "/usr/bin/rhcert-backend", line 37, in <module>
    success = rhcertBackend.do(args)
  File "/usr/lib/python2.6/site-packages/rhcert/client/backend.py", line 188, in do
    result = self.commands[self.command]()
  File "/usr/lib/python2.6/site-packages/rhcert/client/harness.py", line 409, in doRun
    return self._doRun(testDocuments)
  File "/usr/lib/python2.6/site-packages/rhcert/client/harness.py", line 552, in _doRun
    returnValue = self.runTest(logDirectory, testDocument, runDocument, outputFilePath)
  File "/usr/lib/python2.6/site-packages/rhcert/client/harness.py", line 998, in runTest
    rv = test.run()
  File "/usr/lib/python2.6/site-packages/rhcert/suites/hwcert/tests/dvd/dvd.py", line 116, in run
    self.getMediaChoice()
  File "/usr/lib/python2.6/site-packages/rhcert/suites/hwcert/hwcert/opticalDiskTest.py", line 115, in getMediaChoice
    choice = self.prompt("Please choose the media to be tested: ", map(self.printMediaName, self.supportedMedia))
  File "/usr/lib/python2.6/site-packages/rhcert/testUI.py", line 68, in prompt
    return self.ui.prompt(message, validation=validation, default=default)
  File "/usr/lib/python2.6/site-packages/rhcert/commandLineUI.py", line 76, in prompt
    error = validation(response.strip())
TypeError: 'list' object is not callable