fix possible crash in destructor of FeaturePythonPyT template

src/App/FeaturePythonPyImp.h

@@ -24,6 +24,7 @@
 #define APP_FEATUREPYTHONPYIMP_H
 
 #include <Base/BaseClass.h>
+#include <Base/Interpreter.h>
 #include <App/PropertyContainerPy.h>
 
 #define PYTHON_TYPE_DEF(_class_, _subclass_) \

src/App/FeaturePythonPyImp.inl

@@ -84,12 +84,14 @@ template<class FeaturePyT>
 FeaturePythonPyT<FeaturePyT>::FeaturePythonPyT(Base::BaseClass *pcObject, PyTypeObject *T)
     : FeaturePyT(reinterpret_cast<typename FeaturePyT::PointerType>(pcObject), T)
 {
+    Base::PyGILStateLocker lock;
     dict_methods = PyDict_New();
 }
 
 template<class FeaturePyT>
 FeaturePythonPyT<FeaturePyT>::~FeaturePythonPyT()
 {
+    Base::PyGILStateLocker lock;
     Py_DECREF(dict_methods);
 }