[Libreoffice] Rewiew needed for pythonscript.py patch (new try)

[Julien Nabet]

Hello,

Here is a new try for fixing warning/error pychecker in the .py files of 
libs-core/scripting/source/pyprov
Could anybody tell me if this is ok (and i can push it myself) or not ?
This time I used this to check there is no tabs and spaces mixed.
python -tt ppythonscript.py
This one has only spaces.

(I fixed this same pb + attributes not declared in mailmerged.py with 
the commit 97a762bb4f0aa51c20d858eb5b56c35dbb9044d0)

Julien.