bokeh/bokeh — pull request #1534 by varunus (2014-12-10 03:20:47+00:00)
Title: Fall back to "Circle" for unhandled matplotlib markers

Currently, bokeh throws a KeyError if a matplotlib marker not handled by mpl.py is used. This change causes bokeh to instead fall back to the Circle marker, allowing matplotlib graphs to be visualized even if the chosen marker is not handled (albeit with a different marker shape).