Ensure that 'points' is an array to avoid errors when indexing (completes fix for matplotlib#3809).

Author: Matt Li

lib/matplotlib/transforms.py

@@ -2040,6 +2040,8 @@ def __repr__(self):
         return "BlendedGenericTransform(%s,%s)" % (self._x, self._y)
 
     def transform_non_affine(self, points):
+        points = np.asanyarray(points)
+
         if self._x.is_affine and self._y.is_affine:
             return points
         x = self._x