def split_envvar_value(self, rv):
return (rv or '<STR_LIT>').split(self.envvar_list_splitter)<EOL>
Given a value from an environment variable this splits it up
        into small chunks depending on the defined envvar list splitter.

        If the splitter is set to `None`, which means that whitespace splits,
        then leading and trailing whitespace is ignored.  Otherwise, leading
        and trailing splitters usually lead to empty items being included.