You see me when there's nothing there,

I'm nothing but a dastard snare.

You plan, but full of me's you're done.

Picked in, not out, I've you unspun.

If lost in me retrack, no coming back;

I'm black.

'I thought for a moment there would be no riddle!'
'Well, is there a riddle if the riddle is on nothing?'
'You tire me.'

Riddle Answer A Hole

Riddle Explanation
you plan, but full of me's you're done - full of holes.

picked in, not out, I've you unspun - to pick holes in a plan.

if lost in me retrack, no coming back; I'm black - a black hole.