psycopg2.Error.diag properties are None

Hello folks,

I tried to use psycopg2.Error.diag.column_name to get the column that
caused an integrity error. I have got a NOT NULL column and if I insert
NULL I of course get an error. But the diag.column_name of the error is
None.
Code I used: http://pastebin.com/raw/cQd670NK (users.prenames is NOT
NULL in this case)
Output I get:
|ERROR
None
null value in column "prenames" violates not-null constraint

I am using PostgreSQL 9.1.19 and psycopg2 2.6.1 (dt dec pq3 ext).
Corresponding documentation:
http://initd.org/psycopg/docs/module.html#psycopg2.Error.diag

I would appreciate some help.

Thanks,
Martin
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