fix isinstance

Author: LucaMarconato

src/spatialdata_plot/pl/basic.py

@@ -949,7 +949,7 @@ def show(
                     if wanted_labels_on_this_cs:
                         if (table := params_copy.table_name) is not None:
                             colors = sc.get.obs_df(sdata[table], params_copy.color)
-                            if isinstance(colors[params_copy.color].dtype, pd.CategoricalDtype):
+                            if isinstance(colors.dtype, pd.CategoricalDtype):
                                 _maybe_set_colors(
                                     source=sdata[table],
                                     target=sdata[table],

src/spatialdata_plot/pl/render.py

@@ -441,7 +441,7 @@ def _render_points(
     if col_for_color is not None:
         cols = sc.get.obs_df(adata, col_for_color)
         # maybe set color based on type
-        if isinstance(cols[col_for_color].dtype, pd.CategoricalDtype):
+        if isinstance(cols.dtype, pd.CategoricalDtype):
             _maybe_set_colors(
                 source=adata,
                 target=adata,