`TraitError`: label_image_weights shape expected to have 1 components, but got () components

version: 1.0a36, 1.0a35

I've clean-installed on WSL2, not working.

import itk
from itkwidgets import view
from urllib.request import urlretrieve
import os

# Download data
file_name = '005_32months_T2_RegT1_Reg2Atlas_ManualBrainMask_Stripped.nrrd'
if not os.path.exists(file_name):
    url = 'https://data.kitware.com/api/v1/file/564a5b078d777f7522dbfaa6/download'
    urlretrieve(url, file_name)
image = itk.imread(file_name)
view(image, rotate=True, axes=True, vmin=4000, vmax=17000, gradient_opacity=0.9)

---------------------------------------------------------------------------
TraitError                                Traceback (most recent call last)
Cell In[2], line 12
     10     urlretrieve(url, file_name)
     11 image = itk.imread(file_name)
---> 12 view(image, rotate=True, axes=True, vmin=4000, vmax=17000, gradient_opacity=0.9)

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/itkwidgets/widget_viewer.py:1090](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/itkwidgets/widget_viewer.py:1090), 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)
   1087     if image is None and len(images):  # only one image is rendered
   1088         image = images[0]
-> 1090 viewer = Viewer(image=image,
   1091                 label_image=label_image,
   1092                 label_image_names=label_image_names,
   1093                 label_image_blend=label_image_blend,
   1094                 label_image_weights=label_image_weights,
   1095                 cmap=cmap,
   1096                 lut=lut,
   1097                 select_roi=select_roi,
   1098                 interpolation=interpolation,
   1099                 gradient_opacity=gradient_opacity,
   1100                 opacity_gaussians=opacity_gaussians,
   1101                 slicing_planes=slicing_planes,
   1102                 shadow=shadow, blend_mode=blend_mode,
   1103                 point_sets=point_sets,
   1104                 point_set_colors=point_set_colors,
   1105                 point_set_opacities=point_set_opacities,
   1106                 point_set_representations=point_set_representations,
   1107                 point_set_sizes=point_set_sizes,
   1108                 geometries=geometries, geometry_colors=geometry_colors,
   1109                 geometry_opacities=geometry_opacities,
   1110                 rotate=rotate, ui_collapsed=ui_collapsed,
   1111                 annotations=annotations, axes=axes, mode=mode,
   1112                 **kwargs)
   1113 return viewer

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/itkwidgets/widget_viewer.py:369](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/itkwidgets/widget_viewer.py:369), in Viewer.__init__(self, **kwargs)
    365 if have_label_image:
    366     # Interpolation is not currently supported with label maps
    367     kwargs['interpolation'] = False
--> 369 super(Viewer, self).__init__(**kwargs)
    371 if not self.image and not self.label_image:
    372     return

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/ipywidgets/widgets/widget.py:478](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/ipywidgets/widgets/widget.py:478), in Widget.__init__(self, **kwargs)
    476 """Public constructor"""
    477 self._model_id = kwargs.pop('model_id', None)
--> 478 super(Widget, self).__init__(**kwargs)
    480 Widget._call_widget_constructed(self)
    481 self.open()

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:1362](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:1362), in HasTraits.__init__(self, *args, **kwargs)
   1360 for key in changed:
   1361     value = self._traits[key]._cross_validate(self, getattr(self, key))
-> 1362     self.set_trait(key, value)
   1363     changes[key]['new'] = value
   1364 self._cross_validation_lock = False

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:1742](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:1742), in HasTraits.set_trait(self, name, value)
   1740     raise TraitError(f"Class {cls.__name__} does not have a trait named {name}")
   1741 else:
-> 1742     getattr(cls, name).set(self, value)

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:108](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:108), in Array.set(self, obj, value)
    107 def set(self, obj, value):
--> 108     new_value = self._validate(obj, value)
    109     old_value = obj._trait_values.get(self.name, self.default_value)
    110     obj._trait_values[self.name] = new_value

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:738](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traitlets/traitlets.py:738), in TraitType._validate(self, obj, value)
    736     return value
    737 if hasattr(self, "validate"):
--> 738     value = self.validate(obj, value)
    739 if obj._cross_validation_lock is False:
    740     value = self._cross_validate(obj, value)

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/ipydatawidgets/ndarray/traits.py:25](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/ipydatawidgets/ndarray/traits.py:25), in NDArray.validate(self, obj, value)
     24 def validate(self, obj, value):
---> 25     value = super(NDArray, self).validate(obj, value)
     26     if value is None or value is Undefined:
     27         return value

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:105](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:105), in Array.validate(self, obj, value)
    103 except (ValueError, TypeError) as e:
    104     raise TraitError(e)
--> 105 return super(Array, self).validate(obj, value)

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:76](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/traittypes/traittypes.py:76), in SciType.validate(self, obj, value)
     74 try:
     75     for validator in self.validators:
---> 76         value = validator(self, value)
     77     return value
     78 except (ValueError, TypeError) as e:

File [~/mambaforge/envs/itk/lib/python3.11/site-packages/ipydatawidgets/ndarray/traits.py:40](https://untitled+.vscode-resource.vscode-cdn.net/~/mambaforge/envs/itk/lib/python3.11/site-packages/ipydatawidgets/ndarray/traits.py:40), in shape_constraints..validator(trait, value)
     38     return value
     39 if len(value.shape) != len(args):
---> 40     raise TraitError('%s shape expected to have %s components, but got %s components' % (
     41         trait.name, len(args), value.shape))
     42 for i, constraint in enumerate(args):
     43     if constraint is not None:

TraitError: label_image_weights shape expected to have 1 components, but got () components

InsightSoftwareConsortium / itkwidgets

`TraitError`: label_image_weights shape expected to have 1 components, but got () components #679