Google do crawl the content which includes the nofollow links as well, but do not follow the links further, as it happens in the case of dofollow links. Google follows each and every link to reach other pages of your websites and external links if all are dofollow. However, if any of the internal/ external link is nofollow then will definitely crawl it as a part of content but won't follow Google even index the pages, website which are blocked with robots.txt. Have a look at the screenshot: