General - Defense Dice Step

Does rolling zero defense dice force you to skip the step and thereby not allow you to spend any evade tokens or add any evade results?
Magnetomeatric Guided Charges: ATTACK: Disable this card to perform this attack. You may convert 1 of your [Battlestations] results into a [Critical] result. Target ship does not roll defense dice against this attack. This upgrade may only be purchased for a Borg ship.
Enhanced Hull Plating: During the Roll Defense Dice step of the Combat Phase, if you ship is not cloaked and you have no Active Shields, you may add up to 2 [Evade] results to your defense roll. If you do so, place 1 Auxiliary Power Token beside your ship for each [Evade] result you added with this upgrade. This upgrade may only be purchased for a Federation ship. You cannot deploy more than 1 Enhanced Hull Plating [Tech] Upgrade to any ship.
Magnetomeatric Guided Charges: ATTACK: Disable this card to perform this attack. You may convert 1 of your [Battlestations] results into a [Critical] result. Target ship does not roll defense dice against this attack. This upgrade may only be purchased for a Borg ship.
Enhanced Hull Plating: During the Roll Defense Dice step of the Combat Phase, if you ship is not cloaked and you have no Active Shields, you may add up to 2 [Evade] results to your defense roll. If you do so, place 1 Auxiliary Power Token beside your ship for each [Evade] result you added with this upgrade. This upgrade may only be purchased for a Federation ship. You cannot deploy more than 1 Enhanced Hull Plating [Tech] Upgrade to any ship.