message: fix: handle possible PyModule_AddObject failure
  Comment from Python documentation:
  Unlike other functions that steal references, `PyModule_AddObject()` only
  decrements the reference count of value on success.
  This means that its return value must be checked, and calling code must
  `Py_DECREF()` value manually on error.
diff: @@ -229,7 +229,12 @@ PyObject* pyopencv_from(const TYPE& src)
  ERROR_HANDLER; \
  } \
  CVPY_TYPE_INCREF(pyopencv_##NAME##_TypePtr); \
  - PyModule_AddObject(m, #WNAME, (PyObject *)pyopencv_##NAME##_TypePtr); \
  + if (PyModule_AddObject(m, #WNAME, (PyObject *)pyopencv_##NAME##_TypePtr) < 0) \
  + { \
  + printf("Failed to register a new type: " #WNAME ", base (" #BASE ")\n"); \
  + Py_DECREF(pyopencv_##NAME##_TypePtr); \
  + ERROR_HANDLER; \
  + } \
  }
  //==================================================================================================
  @@ -302,10 +307,15 @@ PyObject* pyopencv_from(const TYPE& src)
  pyopencv_##NAME##_TypePtr = PyType_FromSpecWithBases(&pyopencv_##NAME##_Spec, bases); \
  if (!pyopencv_##NAME##_TypePtr) \
  { \
  - printf("Failed to init: " #WNAME ", base (" #BASE ")" "\n"); \
  + printf("Failed to create type from spec: " #WNAME ", base (" #BASE ")\n"); \
  + ERROR_HANDLER; \
  + } \
  + if (PyModule_AddObject(m, #WNAME, (PyObject *)pyopencv_##NAME##_TypePtr) < 0) \
  + { \
  + printf("Failed to register a new type: " #WNAME ", base (" #BASE ")\n"); \
  + Py_DECREF(pyopencv_##NAME##_TypePtr); \
  ERROR_HANDLER; \
  } \
  - PyModule_AddObject(m, #NAME, (PyObject *)pyopencv_##NAME##_TypePtr); \
  }
  // Debug module load:
  