fix(spike_sorting): create empty sorting_analyzer folder when no units found

Author: ttngu207

element_array_ephys/spike_sorting/si_spike_sorting.py

@@ -284,6 +284,7 @@ def make(self, key):
         def _sorting_analyzer_compute():
             if not has_units:
                 log.info("No units found in sorting object. Skipping sorting analyzer.")
+                analyzer_output_dir.mkdir(parents=True, exist_ok=True)  # create empty directory anyway, for consistency
                 return
 
             # Sorting Analyzer