UPA Rules state: "The cue ball must strike the lowest numbered ball first for a legal hit to occur."  I interpreted that to mean "must strike the lowest numbered ball first BEFORE STRIKING ANY OTHER BALL for a legal hit to occur.  I see about fifteen fouls listed (e.g., Bad Hit/wrong ball first, scratch, double hit...) and all the ball fouls address something specific like hitting a legal ball, hitting an illegal ball, ball going off the table, hitting a rail after hitting a ball...but didn't see "Not Striking Any Ball" listed as a foul so that's why I was asking about this.  I was thinking that if the cue ball did not hit an object ball, then does that mean that a hit (legal or illegal) didn't occur?   Anyway, the "not hitting any ball" wasn't clear to me - and I think I over-thunk it!  Based on the great responses I get it now.  Thanks to everyone that responded.