Even with the fix for single-point transforms (77ccc82) it's better to ensure we have a 2D array to avoid further case distinctions below.

maxalbert · maxalbert · commit 9dcc1fa5c630 · 2014-12-04T10:14:11.000Z
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -2040,7 +2040,7 @@ def __repr__(self):
         return "BlendedGenericTransform(%s,%s)" % (self._x, self._y)
 
     def transform_non_affine(self, points):
-        points = np.asanyarray(points)
+        points = np.asanyarray(points).reshape((-1, 2))
 
         if self._x.is_affine and self._y.is_affine:
             return points
