[mod_python] null pointer to PyObject_CallMethod

Graham Dumpleton wrote:
> ..... Confirm in your application that main interpreter is being used 
> by dumping out
> 'apache.interpreter' or 'req.interpreter'.

Interesting, I can see some use for that in Trac, as running in 
sub-interpreters also proves to be problematic for us.

That's a known problem together with the Subversion bindings, but seeing 
now that weird error reported for cx_Oracle and your suggestion, I 
wonder if some other, equally weird error involving mod_python and 
mysql-python couldn't be explained by the same cause (see 
http://trac.edgewall.org/ticket/5012).

-- Christian