[Libreoffice] Review needed for Python part patch

[Julien Nabet]

Hello,

Here is a patch 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 ?
I already fixed a simple bug (commit 
60b368fa19ced4595bfba8068b1e5769a1be187d) but this time I would like to 
be advised since I don't know Python at all.

There are still warning/errors with pychecker :
"
Processing module mailmerge (mailmerge.py)...
Processing module officehelper (officehelper.py)...
Processing module pythonscript (pythonscript.py)...

Warnings...

mailmerge.py:377: Function return types are inconsistent
mailmerge.py:379: Function return types are inconsistent

pythonscript.py:11: Should not assign to NONE, it is similar to builtin None
pythonscript.py:659: Instantiating an object with arguments, but no 
constructor
pythonscript.py:890: Redefining attribute (getScript) original line (885)
"

Julien.
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