fix iterable type

Author: LucaMarconato

src/spatialdata_plot/pl/basic.py

@@ -948,7 +948,8 @@ 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)
+                            keys = [params_copy.color] if not isinstance(params_copy.color, list) else params_copy.color
+                            colors = sc.get.obs_df(sdata[table], keys)
                             if isinstance(colors.dtype, pd.CategoricalDtype):
                                 _maybe_set_colors(
                                     source=sdata[table],

src/spatialdata_plot/pl/render.py

@@ -439,7 +439,8 @@ def _render_points(
     )
 
     if col_for_color is not None:
-        cols = sc.get.obs_df(adata, col_for_color)
+        keys = [col_for_color] if not isinstance(col_for_color, list) else col_for_color
+        cols = sc.get.obs_df(adata, keys)
         # maybe set color based on type
         if isinstance(cols.dtype, pd.CategoricalDtype):
             _maybe_set_colors(