message: python: minor fix, add assert to unsupported functions
diff: @@ -418,7 +418,7 @@ public:
  void forward(const FFModel&);
  void backward(const FFModel&);
  void print_layer(const FFModel& model) {assert(0);}
  - Parameter* get_parameter(int index) {return NULL;}
  + Parameter* get_parameter(int index) {assert(0); return NULL;}
  static void forward_task(const Task *task,
  const std::vector<PhysicalRegion> &regions,
  Context ctx, Runtime *runtime);
  @@ -451,7 +451,7 @@ public:
  void forward(const FFModel&);
  void backward(const FFModel&);
  void print_layer(const FFModel& model) {assert(0);}
  - Parameter* get_parameter(int index) {return NULL;}
  + Parameter* get_parameter(int index) {assert(0); return NULL;}
  static void forward_task(const Task *task,
  const std::vector<PhysicalRegion> &regions,
  Context ctx, Runtime *runtime);
  