pyshyacc: allow double COMMA statements
this allows shell statements like '; ;' to pass the parser.
As it may be bad code but still valid enough to execute
Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b7732b1b5085bea73e17d112e1bd9ac3d4dc34fb)
Signed-off-by: Steve Sakoman <steve@sakoman.com>