This should fix problems with paraviewweb and python 2.6.

It is not as nice as the previous version, but it should not break
on systems with python 2.6.

Change-Id: I0df413528e6aa54e41d09d6ccf4b764990ad6b3e
Merge topic 'fix-problems-with-python26' into master

2ac0cc8f This should fix problems with paraviewweb and python 2.6.