Fem: Expose Constraint view provider symbol node to Python

src/Mod/Fem/Gui/ViewProviderFemConstraint.cpp

@@ -47,6 +47,7 @@
 
 #include "TaskFemConstraint.h"
 #include "ViewProviderFemConstraint.h"
+#include "ViewProviderFemConstraintPy.h"
 
 
 using namespace FemGui;
@@ -215,6 +216,15 @@ void ViewProviderFemConstraint::unsetEdit(int ModNum)
         }
     }
 }
+
+PyObject* ViewProviderFemConstraint::getPyObject()
+{
+    if (!pyViewObject) {
+        pyViewObject = new ViewProviderFemConstraintPy(this);
+    }
+    pyViewObject->IncRef();
+    return pyViewObject;
+}
 /*
 // Create a local coordinate system with the z-axis given in dir
 void getLocalCoordinateSystem(const SbVec3f& z, SbVec3f& y, SbVec3f& x)