How to calculate the success rate against non-occurring events?

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I am calculating a football team's success rate ofShots Savedagainst the opposition'sShots On Targetfor every match. It's very simple, but I have come across something that I need some clarity and perspective on:

If a football team did not register a single shot on target, should the opposition receive0.00%forShots Savedas they did not save any shots,100.00%because they didn't fail to save any shots and shouldn't be penalised, or would I go with50.00%because if a shot were to have occurred, it may have been saved, or may not have been saved (Schrödinger's paradox)?

At the moment, I've left it at0.00%but it has a negative impact when averaging the success rate over a number of matches. Technically, it's true, but it also seems to penalise a team when the event occurring was possibly prevented due to another part of their game, which should possibly be rewarded?

Your opinions would be greatly appreciated!

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This is equivalent to quantifying $\frac00$ which is undefined. Do not take a reading if this occurs.