Had a look at me other pack of baps, wholemeal - no salt, white - salt, but both with the same percentage of sodium per 100g (0.5g).
Try it totally without, once, and see how it turns out.
I never put salt when I cook veg, as I reckon the gravy has enough in it, I don't even miss it, but flip, do I notice when someone adds a spoon to their veg pan.