Optimizing Revenue Generation: Handling Zero Values in AI Outputs

Need help, I'm trying to enrich the company revenue using a waterfall. Where the first step is simple google lookup for public information. 2nd onwards I'm using tools to find revenue. But the problem is, if Ai doesn't find anything on google it returns "0" and other tool don't run because "0" is also a valid output. hence it shows "run condition not met. Is there a way to return a emty value when revenue in not found by AI?? Or setup a condition that says, run the remaining tools if the value is "0" I hope i didn't make it confusing to understand 😐