Testdrive-gtk crashes when installed from 3.20

[Jackson Doak]

When running the command "testdrive-gtk" (installed from source 3.20) you receive the error:

Traceback (most recent call last):
  File "/usr/local/bin/testdrive-gtk", line 1000, in <module>
    window = TestdrivegtkWindow()
  File "/usr/local/bin/testdrive-gtk", line 111, in __new__
    builder = get_builder('TestdrivegtkWindow')
  File "/usr/local/lib/python2.7/dist-packages/testdrivegtk/helpers.py", line 44, in get_builder
    ui_filename = get_data_file('ui', '%s.ui' % (builder_file_name,))
  File "/usr/local/lib/python2.7/dist-packages/testdrivegtk/testdrivegtkconfig.py", line 54, in get_data_file
    return os.path.join(get_data_path(), *path_segments)
  File "/usr/local/lib/python2.7/dist-packages/testdrivegtk/testdrivegtkconfig.py", line 71, in get_data_path
    raise project_path_not_found
testdrivegtk.testdrivegtkconfig.project_path_not_found