One more minor fix to get bar3d to accept empty inputs. Also added CHANGELOG entry.

Author: WeatherGod

CHANGELOG

@@ -1,3 +1,6 @@
+2011-06-28 3D versions of scatter, plot, plot_wireframe, plot_surface,
+           bar3d, and some other functions now support empty inputs. - BVR
+
 2011-06-16 Added *bottom* keyword parameter for the stem command. 
            Also, implemented a legend handler for the stem plot. 
            - JJL

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -872,7 +872,7 @@ def _shade_colors(self, color, normals):
             colors = (0.5 + norm(shade)[:, np.newaxis] * 0.5) * color
             colors[:, 3] = alpha
         else:
-            colors = color.copy()
+            colors = np.asanyarray(color).copy()
 
         return colors
 
@@ -1366,6 +1366,7 @@ def bar3d(self, x, y, z, dx, dy, dz, color='b',
         if len(x) != len(y) or len(x) != len(z):
             warnings.warn('x, y, and z must be the same length.')
 
+        # FIXME: This is archaic and could be done much better.
         minx, miny, minz = 1e20, 1e20, 1e20
         maxx, maxy, maxz = -1e20, -1e20, -1e20