Creating a discount code for all products with no discount

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i'm in need of some guidance for creating a collection, that only includes products with no discounts ( previous solution was "compare at price --> lower than 1")

Our products gets generated by our own software, which imports product data into Shopify. A recent change has made it so, that the compare at price no longer can be "0" when products are created from this software. Which makes me unable to create a collection only containing non discounted items

is there another way of sorting? can you add a placeholder of "0" when no discount is present?