One key question to answer that affects how to accomplish this, is the 2nd drop down simply hidden or is it actually removed from the DOM (i.e. the HTML driving the page). Assuming it's simply hidden there are a few different ways to do this. You can verify whether the element is not visible or disabled.
Please watch this video
demonstrating how to use the DOM explorer to locate an element that is not visible on screen to perform a verification on it. It may be easier for you to create the "element is not visible" verification first, while it is still visible, and then drag the Verify step after the step that hides it. This way prevents hunting through the DOM.
To verify if an element is disabled, please read this KB article
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