Check if it's really a PythonExtension and throw an err if not rather then crashing
Check if it's really a PythonExtension and throw an err if not rather then crashing

svn path=/trunk/koffice/libs/kross/python/; revision=611457

KDE/kross-interpreters,KDE/kross-interpreters,KDE/kross-interpreters,KDE/kross-interpreters,KDE/kross-interpreters,KDE/kross-interpreters