You can also check for does not have text, has an image, and does not have image, so using one of those options, you should be able to make your macro do what you'd like it to do. (If it has an image, delete it until it's text? I'm not sure how you want to handle the image case, but you'll do it through either the Case or If-Then statements.)
One bit of advice. Nested If Then Actions can make Macros difficult to read and debug. In this case you could just have both conditions in a single If Then: