Defend against possible crash if a plpython function does not specify names

Tom Lane <tgl@sss.pgh.pa.us>

Commit: cd331e4b845f9206aa89e4f31bb75a040fef87ba
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-04-03T16:59:43Z
Releases: 8.4.0
Defend against possible crash if a plpython function does not specify names
for its arguments.  Also add a regression test, since someone apparently
changed every single plpython test case to use only named parameters; else
we'd have noticed this sooner.

Euler Taveira de Oliveira, per a report from Alvaro

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