Fix parent() method for strip_root to handle empty parent paths

Signed-off-by: Kaushik <kaushikrjpm10@gmail.com>

Author: Kaushik-Kumar-CEG

src/scancode/cli.py

@@ -1080,6 +1080,17 @@ def echo_func(*_args, **_kwargs):
                     resource.path = stripped_path
                     new_resources_by_path[stripped_path] = resource
                 codebase.resources_by_path = new_resources_by_path
+                
+                # Fix parent() to handle empty parent_path for direct children of root.
+                # commoncode's parent() uses `return path and get_resource(path)` which 
+                # returns '' (empty string) when path is '', breaking tree traversal.
+                original_parent = codebase.resource_class.parent
+                def patched_parent(self, codebase_arg):
+                    parent_path = self.parent_path()
+                    if parent_path == '':
+                        return codebase_arg.root
+                    return original_parent(self, codebase_arg)
+                codebase.resource_class.parent = patched_parent
 
     finally:
         # remove temporary files