running example in binder: itk.ShrinkImageFilter is not wrapped for input type `None`

[jcfr]

Step to reproduce

1. Open https://mybinder.org/v2/gh/InsightSoftwareConsortium/ITKColorNormalization/8b61138b70d780763c3aeac909c27a3026887d2e

2. Go to examples and open the notebook

3. Menu Cell -> Run All

Execution of cell with view(input_image) returns the following error:

---------------------------------------------------------------------------
TemplateTypeError                         Traceback (most recent call last)
<ipython-input-5-4c9c2af28ff6> in <module>
----> 1 view(input_image)

/srv/conda/envs/notebook/lib/python3.7/site-packages/itkwidgets/widget_viewer.py in view(image, label_image, label_image_names, label_image_weights, label_image_blend, cmap, lut, select_roi, interpolation, gradient_opacity, opacity_gaussians, channels, slicing_planes, shadow, blend_mode, point_sets, point_set_colors, point_set_opacities, point_set_representations, point_set_sizes, geometries, geometry_colors, geometry_opacities, ui_collapsed, rotate, annotations, axes, mode, **kwargs)
   1084                     rotate=rotate, ui_collapsed=ui_collapsed,
   1085                     annotations=annotations, axes=axes, mode=mode,
-> 1086                     **kwargs)
   1087     return viewer

/srv/conda/envs/notebook/lib/python3.7/site-packages/itkwidgets/widget_viewer.py in __init__(self, **kwargs)
    408                 if size[dim] > self.size_limit_3d[dim]:
    409                     self._downsampling = True
--> 410         self._update_rendered_image()
    411         if self._downsampling:
    412             self.observe(self._on_roi_changed, ['roi'])

/srv/conda/envs/notebook/lib/python3.7/site-packages/itkwidgets/widget_viewer.py in _update_rendered_image(self)
    488             if self.image:
    489                 self.extractor = itk.ExtractImageFilter.New(self.image)
--> 490                 self.shrinker = itk.ShrinkImageFilter.New(self.extractor)
    491                 self.shrinker.SetShrinkFactors(scale_factors[:dimension])
    492             if self.label_image:

/srv/conda/envs/notebook/lib/python3.7/site-packages/itkTemplate.py in New(self, *args, **kwargs)
    522 or via one of the following keyword arguments: %s""" % ", ".join(primary_input_methods))
    523             else:
--> 524                 raise TemplateTypeError(self, input_type)
    525         return self[list(keys)[0]].New(*args, **kwargs)
    526 

TemplateTypeError: itk.ShrinkImageFilter is not wrapped for input type `None`.

To limit the size of the package, only a limited number of
types are available in ITK Python. To print the supported
types, run the following command in your python environment:

    itk.ShrinkImageFilter.GetTypes()

Possible solutions:
* If you are an application user:
** Convert your input image into a supported format (see below).
** Contact developer to report the issue.
* If you are an application developer, force input images to be
loaded in a supported pixel type.

    e.g.: instance = itk.ShrinkImageFilter[itk.Image[itk.SS,2], itk.Image[itk.SS,2]].New(my_input)

* (Advanced) If you are an application developer, build ITK Python yourself and
turned to `ON` the corresponding CMake option to wrap the pixel type or image
dimension you need. When configuring ITK with CMake, you can set
`ITK_WRAP_${type}` (replace ${type} with appropriate pixel type such as
`double`). If you need to support images with 4 or 5 dimensions, you can add
these dimensions to the list of dimensions in the CMake variable
`ITK_WRAP_IMAGE_DIMS`.

Supported input types:

itk.Image[itk.SS,2]
itk.Image[itk.SS,3]
itk.Image[itk.UC,2]
itk.Image[itk.UC,3]
itk.Image[itk.US,2]
itk.Image[itk.US,3]
itk.Image[itk.F,2]
itk.Image[itk.F,3]
itk.Image[itk.D,2]
itk.Image[itk.D,3]