Log Message:
-----------
Tweak the error message emitted when a void-returning PL/Python function
does not return None, per suggestion from Tom.
Modified Files:
--------------
pgsql/src/pl/plpython:
plpython.c (r1.72 -> r1.73)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/plpython.c.diff?r1=1.72&r2=1.73)
pgsql/src/pl/plpython/expected:
plpython_test.out (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/expected/plpython_test.out.diff?r1=1.2&r2=1.3)