def comma_separated_str_to_list(config_val, evar):
if not config_val:<EOL><INDENT>return []<EOL><DEDENT>return [token.strip() for token in config_val.split('<STR_LIT:U+002C>')]<EOL>
Splits a comma-separated environment variable into a list of strings.

:param str config_val: The env var value.
:param EnvironmentVariable evar: The EVar object we are validating
    a value for.
:rtype: list
:return: The equivalent list for a comma-separated string.