Resolve "Migrate from StateBlock to StateDerived"

Closes #465 (closed)

include/core/state_block/state_block.h

@@ -188,7 +188,7 @@ public:
 
         void setNonTransformable() {transformable_ = false;}
 
-        virtual void transform(const VectorComposite& _transformation) {};
+        virtual void transform(const VectorComposite& _transformation) = 0;
 
         void plus(const Eigen::VectorXd& _dv);