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

src/pl/plpython/expected/plpython_function.out

@@ -357,8 +357,11 @@ CREATE FUNCTION test_return_none() RETURNS int AS $$
 None
 $$ LANGUAGE plpythonu;
 --
--- Test named parameters
+-- Test named and nameless parameters
 --
+CREATE FUNCTION test_param_names0(integer, integer) RETURNS int AS $$
+return args[0] + args[1]
+$$ LANGUAGE plpythonu;
 CREATE FUNCTION test_param_names1(a0 integer, a1 text) RETURNS boolean AS $$
 assert a0 == args[0]
 assert a1 == args[1]

src/pl/plpython/expected/plpython_test.out

@@ -197,7 +197,13 @@ SELECT test_return_none(), test_return_none() IS NULL AS "is null";
                   | t
 (1 row)
 
--- Test for functions with named parameters
+-- Test for functions with named and nameless parameters
+SELECT test_param_names0(2,7);
+ test_param_names0 
+-------------------
+                 9
+(1 row)
+
 SELECT test_param_names1(1,'text');
  test_param_names1 
 -------------------