IndexError accessing deprecated GtkStyle

The GtkStyle object returned by GtkWidget.get_style() is deprecated in GTK 3.4. I get a TB when using
    bzr gannotate
 using tip on quantal:

  File "/home/curtis/.bazaar/plugins/gtk/commands.py", line 267, in run
    window = GAnnotateWindow(all, plain, branch=br)
  File "/home/curtis/.bazaar/plugins/gtk/annotate/gannotate.py", line 59, in __init__
    self._create()
  File "/home/curtis/.bazaar/plugins/gtk/annotate/gannotate.py", line 196, in _create
    self.annoview = self._create_annotate_view()
  File "/home/curtis/.bazaar/plugins/gtk/annotate/gannotate.py", line 283, in _create_annotate_view
    "cell-background-rgba",
IndexError: list index out of range