fixup! fix unbound case

Author: tayheau

src/spikeinterface/widgets/rasters.py

@@ -436,6 +436,7 @@ def __init__(
         if unit_ids is None:
             unit_ids = sorting.unit_ids
 
+        depth_dict = None
         if isinstance(sorting_analyzer_or_sorting, SortingAnalyzer):
             if not sorting_analyzer_or_sorting.has_extension("unit_locations"):
                 if sort_by_depth:
@@ -446,8 +447,6 @@ def __init__(
                 depth_dict = {b: i for i, b in enumerate(unit_ids[s_args_depths].tolist())}
         elif sort_by_depth:
             raise AttributeError("`sort_by_depth=True` requires a SortingAnalyzer")
-        else:
-            depth_dict = None
 
         # Create dict of dicts structure
         spike_train_data = {}