improved wrapper check to avoid crashes on virtual methods while python object gets deleted
improved wrapper check to avoid crashes on virtual methods while python object gets deleted

git-svn-id: 798ddaf8a6378b58a8fe2f38b191889029e27a7f@245 ea8d5007-eb21-0410-b261-ccb3ea6e24a9

Alzathar/PythonQt,Alzathar/PythonQt,iltommi/PythonQt,wireload/PythonQt,rkhlebnikov/PythonQt,rkhlebnikov/PythonQt,jeandet/PythonQt,iltommi/PythonQt,iltommi/PythonQt,rkhlebnikov/PythonQt,jeandet/PythonQt,msmolens/PythonQt,msmolens/PythonQt,wireload/PythonQt,jeandet/PythonQt,Alzathar/PythonQt,rkhlebnikov/PythonQt,wireload/PythonQt,msmolens/PythonQt,Alzathar/PythonQt,msmolens/PythonQt,Alzathar/PythonQt,iltommi/PythonQt,wireload/PythonQt,jeandet/PythonQt