added guards to deal with 'none' case properly

tacaswell · Thomas A Caswell · commit 639034dfcaaf · 2013-01-11T23:17:26.000-06:00
diff --git a/lib/matplotlib/lines.py b/lib/matplotlib/lines.py
@@ -574,13 +574,15 @@ def draw(self, renderer):
                     marker_trans = marker_trans.scale(w)
                 else:
                     gc.set_linewidth(0)
-                gc.set_alpha(rgbaFace[3])
+                if rgbaFace is not None:
+                    gc.set_alpha(rgbaFace[3])
                 renderer.draw_markers(
                     gc, marker_path, marker_trans, subsampled, affine.frozen(),
                     rgbaFace)
                 alt_marker_path = marker.get_alt_path()
                 if alt_marker_path:
-                    gc.set_alpha(rgbaFaceAlt[3])
+                    if rgbaFaceAlt is not None:
+                        gc.set_alpha(rgbaFaceAlt[3])
                     alt_marker_trans = marker.get_alt_transform()
                     alt_marker_trans = alt_marker_trans.scale(w)
                     renderer.draw_markers(
