is there a minimum damage? how...

[Axly Suregrip]

With different groups I have seen this done different ways. I wanted to see if there is a consensus for how the rules intended this to be done.

If you have a Saber (2-2) and roll 2, is the damage:
0: since 2 minus 2 is zero
1: since some believe their is a minimum damage (I cannot find it in the rules)
2: some believe each die has a minimum of 1 (ditto)

Similarly, I do see that missile spells now have a minimum of damage equal to the ST put into the spell. But is that per die or after summing it all up?

-kind regards
-Alan