PLY Import: Hide empty operator properties sidebar in file browser

The sidebar is empty for the PLY importer, so better to hide it.

release/scripts/modules/bpy_extras/io_utils.py

@@ -116,6 +116,13 @@ class ImportHelper:
         subtype='FILE_PATH',
     )
 
+    # Hide opertator properties, rest of this is managed in C. See WM_operator_properties_filesel().
+    hide_props_region: BoolProperty(
+        name="Hide Operator Properties",
+        description="Collapse the region displaying the operator settings",
+        default=True,
+    )
+
     def invoke(self, context, _event):
         context.window_manager.fileselect_add(self)
         return {'RUNNING_MODAL'}