Some tests have some dirtyness

[Natalia Bidart]

There is a bunch of:

  SetupAccountFakeWizardTestCase
    test_blank_name ... Traceback (most recent call last):
  File "/home/nessita/canonical/u1/windows-installer/review_wizard-sizes/ubuntuone_installer/gui/qt/setup_account.py", line 181, in showEvent
    self.set_up_button.setDefault(True)
AttributeError: 'NoneType' object has no attribute 'setDefault'

And this other one:

Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/home/nessita/canonical/u1/windows-installer/review_wizard-sizes/ubuntuone_installer/gui/qt/local_folders.py", line 86, in run
    total_size += os.path.getsize(fp)
  File "/usr/lib/python2.7/genericpath.py", line 49, in getsize
    return os.stat(filename).st_size
OSError: [Errno 2] No such file or directory: '/tmp/tmp_hLsNb/test_file'