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Well, you can't 100% rely on third-party tools anyways they might miss it sometimes especially Moz, they are still rookie in this. The other day, I got an email from Moz saying that we couldn't crawl one of your site "Warning" Red alert etc, Robots.txt isn't there. I doubled check it manually everything was smooth and then I made Moz re-crawl the site to check if everything is okay so yes it was. Moz needs to work hard to improve their tool and it's function it doesn't give you the proff look and feel.

I'd love to see this as well!