adapt to different constructors in 2.8 vs. 3.0

Author: Janne Härkönen

src/robotide/ui/tree.py

@@ -287,7 +287,12 @@ def _create_node_with_handler(self, parent_node, controller, index=None):
                                  index, with_checkbox=(handler_class == TestCaseHandler and self._checkboxes_for_tests))
         if isinstance(controller, ResourceFileController):
             if not controller.is_used():
-                self.SetItemTextColour(node, Colour(0xA9, 0xA9, 0xA9))
+                try:
+                    colour = Colour(0xA9A9A9)
+                except:
+                    #wxPython 3.0 compatibilty
+                    colour = Colour(0xA9, 0xA9, 0xA9)
+                self.SetItemTextColour(node, colour)
         self.SetPyData(node, handler_class(controller, self, node, self._controller.settings))
         if controller.is_excluded():
             self._set_item_excluded(node)