PluginTreeBuilder.py:17 - AttributeError: 'NoneType' object has no attribute 'is_uri'

[mxmilkiib]

After copying style.qss to ~/.config/surplus (#7), I get;

./surplus 
checking config..
config ok
Traceback (most recent call last):
  File "src/surplus", line 278, in <module>
    main = MainWindow()
  File "src/surplus", line 87, in __init__
    self._initPluginsTab()
  File "src/surplus", line 165, in _initPluginsTab
    build = PluginTreeBuilder()
  File "/home/milk/src/surplus/src/PluginTreeBuilder.py", line 17, in __init__
    if not a.get_class().get_parent_uri().is_uri():
AttributeError: 'NoneType' object has no attribute 'is_uri'