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The main parser and other code copes with empty python functions but
the python codeparser does not. Fix this to avoid errors with code like:
python do_build () {
}
which currently results in the obtuse:
"Failure expanding variable do_build: IndexError: string index out of range"
[YOCTO #7829]
(Bitbake rev: e4f594c670189e04d58ce7d160fc1d86123620af)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>