@_handle_object_not_found
    def remove_metadata_key(self, obj, key):
        meta_dict = {key: ""}
        return self.set_metadata(obj, meta_dict)
Removes the specified key from the object's metadata. If the key does
dataset/ETHPy150Open rackspace/pyrax/pyrax/object_storage.py/StorageObjectManager.remove_metadata_key