Exception translation generates invalid code if return value is wrapped (i.e. not primitive)

[Kirill Lapshin]

Adding to foo.h

Tupl my_throwing_func () throw(std::exception);

generates invalid C++ code, which fails to compile with following error:

default/tests/foomodulegen_module2.cc: In function ‘PyObject* _wrap_foo4_my_throwing_func()’:
default/tests/foomodulegen_module2.cc:778: error: ‘retval’ was not declared in this scope

Same problem can also be triggered with new 'throw' annotation:

// -#- throw=std::exception -#-
Tupl my_throwing_func ();

[Riyaz Haque (rfhaque)]

The bug still manifests if the return value is a reference. The error generated now is:

foo.cc: In function 'PyObject* _wrap_PyFoo_errorFunc(PyFoo*, PyObject*, PyObject*)':
foo.cc:630: error: 'retval' declared as reference but not initialized