fix benchmark load with partial result

Author: samuelgarcia

src/spikeinterface/benchmark/benchmark_base.py

@@ -593,16 +593,20 @@ def load_folder(cls, folder):
                         result[k] = pickle.load(f)
             elif format == "sorting":
                 from spikeinterface.core import load_extractor
-
-                result[k] = load(folder / k)
+                sorting_folder = folder / k
+                if sorting_folder.exists():
+                    result[k] = load(sorting_folder)
             elif format == "Motion":
                 from spikeinterface.core.motion import Motion
-
-                result[k] = Motion.load(folder / k)
+                motion_folder = folder / k
+                if motion_folder.exists():
+                    result[k] = Motion.load(motion_folder)
             elif format == "zarr_templates":
                 from spikeinterface.core.template import Templates
+                zarr_folder = folder / k
+                if zarr_folder.exists():
 
-                result[k] = Templates.from_zarr(folder / k)
+                    result[k] = Templates.from_zarr(zarr_folder)
 
         return result