Chi-squared or Fisher test with a row of 0s

I want to show that screening for a specific condition has no effect. I created a 2 x 2 contingency table that looks something like:

-------------- Screened --- Not Screened
Seizure ----- 0 ------------ 0
No Seizure - 200 --------- 150

Unfortunately, after a long chart review I found that there were no seizures in either category and so I cannot do a Chi-squared or Fisher exact test. Nonetheless, this is clinically useful information that supports not screening. Is there another statistical test that I could use to make my argument?