Inconsistency in parameters to storage_prefix_path

[nicoavn]

This function is expecting the location param to have a value:

    @staticmethod
    def storage_prefix_path(location, filename):
        """Join the location path with the filename to get the full object path"""
        if filename.startswith('.'):
            filename = filename[1:]
        return '/'.join([location.value, filename])

But this usage in storage_delete_file could potentially pass a None value, as the parameter is optional and has None as the default value.

    @classmethod
    @storage_args()
    def storage_delete_file(cls, filename, storage_location=None, storage_profile=None):
        """Remove file data from storage."""
        storage_instance = cls.storage_get_profile(storage_profile)
        storage_instance.delete(path=cls.storage_prefix_path(storage_location, filename)) <------- here, storage_location could be None
        return True