Description of problem:
traceback after several hwcert automated tests ran.

Version-Release number of selected component (if applicable):
1.7.0


How reproducible:


Steps to Reproduce:
1. run beaker test /distribution/hwcert-client/single test in beaker, reserving afterward to diagnose problems.
2. run hwcert-backend print


Actual results:
$ hwc print
Traceback (most recent call last):
  File "/usr/bin/hwcert-backend", line 45, in <module>
    success = hwcertBackend.do(args)
  File "/usr/share/hwcert/lib/hwcert/backend.py", line 182, in do
    result = self.commands[self.command]()
  File "/usr/share/hwcert/lib/hwcert/harness.py", line 702, in doPrint
    self.load()
  File "/usr/share/hwcert/lib/hwcert/harness.py", line 57, in load
    self.certification.load(self.environment.getResultsPath())
  File "/usr/share/hwcert/lib/hwcert/certificationtest.py", line 182, in load
    DocumentBase.load(self, filename)
  File "/usr/share/hwcert/lib/hwcert/documentbase.py", line 275, in load
    self.document = parse(file)
  File "/usr/lib64/python2.7/site-packages/_xmlplus/dom/minidom.py", line 1915, in parse
    return expatbuilder.parse(file)
  File "/usr/lib64/python2.7/site-packages/_xmlplus/dom/expatbuilder.py", line 930, in parse
    result = builder.parseFile(file)
  File "/usr/lib64/python2.7/site-packages/_xmlplus/dom/expatbuilder.py", line 211, in parseFile
    parser.Parse("", True)
xml.parsers.expat.ExpatError: no element found: line 1, column 0


Expected results:
output listing hwcert tests planned, passed, or failed.


Additional info:
/var/lock/subsys/hwcert may have already existed, so will post new results after cleaning and trying to reproduce the problem under different conditions.

most other hwcert-backend commands appear to fail with the same traceback.

clean does not fail, but fixes the problem.