+ raise exception instead of crashing when trying to access curvature info via Python

src/Mod/Points/App/Properties.cpp

@@ -553,6 +553,16 @@ void PropertyCurvatureList::removeIndices( const std::vector<unsigned long>& uIn
     setValues(remainValue);
 }
 
+PyObject *PropertyCurvatureList::getPyObject(void)
+{
+    throw Py::NotImplementedError("Not yet implemented");
+}
+
+void PropertyCurvatureList::setPyObject(PyObject *)
+{
+    throw Py::NotImplementedError("Not yet implemented");
+}
+
 void PropertyCurvatureList::Save (Base::Writer &writer) const
 {
     if (!writer.isForceXML()) {

src/Mod/Points/App/Properties.h

@@ -205,6 +205,9 @@ public:
         return _lValueList;
     }
 
+    virtual PyObject *getPyObject(void);
+    virtual void setPyObject(PyObject *);
+
     /** @name Save/restore */
     //@{
     void Save (Base::Writer &writer) const;