Problem when plotting certain points annotations columns

[LucaMarconato]

Plotting certain dataframe annotation columns into the points leads to an error.

Easy to reproduce:

from spatialdata.datasets import blobs
from napari_spatialdata import Interactive

Interactive(blobs())

The annotation:

• global > blobs_points > Dataframe columns: instance_id can be plotted
• global > blobs_points > Dataframe columns: genes cannot be plotted and gives the following error:

  
  ...
  File ~/embl/projects/basel/napari-spatialdata/src/napari_spatialdata/_widgets.py:200, in AListWidget._(self=<napari_spatialdata._widgets.AListWidget object>, vec=0      gene_b
  1      gene_b
  2      gene_b
  3     ...gory
  Categories (2, object): ['gene_a', 'gene_b'], **kwargs={'key': 'genes'})
  198     element_indices = element_indices[element_indices != 0]
  199 # When merging if the row is not present in the other table it will be nan so we can give it a default color
  --> 200 if (vec_color_name := vec.name + "_color") not in self.model.adata.uns:
      vec_color_name = 'genes_color'
      vec = 0      gene_b
  1      gene_b
  2      gene_b
  3      gene_a
  4      gene_b
      ...  
  195    gene_a
  196    gene_b
  197    gene_a
  198    gene_a
  199    gene_a
  Name: genes, Length: 200, dtype: category
  Categories (2, object): ['gene_a', 'gene_b']
      self = <napari_spatialdata._widgets.AListWidget object at 0x333907760>
  201     colorer = AnnData(shape=(len(vec), 0), obs=pd.DataFrame(index=vec.index, data={"vec": vec}))
  202     _set_colors_for_categorical_obs(colorer, "vec", palette="tab20")

AttributeError: 'NoneType' object has no attribute 'uns'

[BioinfoTongLI]

having exactly this issue. Any quick fix?

[melonora]

I would have time to look tomorrow afternoon but I think this is an easy fix