This was meant to be squashed into the previous commit for multiline comment
handling. It fixes the case the commented multiline is followed by an empty
line which was resulting in a traceback instead of a sane error message.
(Bitbake rev: 7e7d692e244fe8dca533f842ca143b9c821e317c)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>