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How to filter out items with non-existent properties

Hello,

Sometimes when I do a YQL query using yahoo.finaince.keystats some tickers return empty results. I'm specifically looking for items which have a 'DividendPayout' attribute greater than a specific value. However, when I apply my filter, it includes items that do not have a 'DividendPayout' attribute.

How can I filter them out?

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