One way we tried to deal with situations like this (security issues where we had actual numbers that should never have been transmitted) was to have our "navigation" code always review the retreived page for violations. We knew that this one user had an internal number of "511000" and we knew that we never wanted to transmit that number to the client browser - even if it were not visible.
So, this doesn't get you the automatic display of all pages that DON'T have text but if that text is expected on every page (or you can identify which pages SHOULD have it on it) then you could add a test to your script that will warn you if it does not appear on the page.
This would allow you to fail if it's ever not found, then just navigate as much as you can as part of the tests.
I hope this helps and I HOPE that you're using programmed rather than recorded tests. if you are using recording you will find that this is NOT a very easy option.