message: avoid create_transient_texture to crash on invalid EPixelFormat
diff: @@ -153,6 +153,9 @@ PyObject *py_unreal_engine_create_transient_texture(PyObject * self, PyObject *
  UTexture2D *texture = UTexture2D::CreateTransient(width, height, (EPixelFormat)format);
  + if (!texture)
  + return PyErr_Format(PyExc_Exception, "unable to create texture");
  +
  texture->UpdateResource();
  ue_PyUObject *ret = ue_get_python_wrapper(texture);
  