I guess that the message means that the overturning moment (wind, seismic and maybe external fores/ moments on nozzles ) is less than the moment resisting to uplift (due to weight), in the end of calculation there is no leg/no bolt in tension.
Maybe in future development will be worth to consider the effect of Vleg as shear force and the bending moment ("Bending at the Bottom of the Leg" based on Vleg) as loading the plate and bolt.