Blogger Blogspot - How to fix Http to Https redirect SEO violation

Question

In SEO analysis report of my blog, I found this violation message more than thousand times.

The link to "http://myblog.blogspot.com/search/label/ASP.Net" has resulted in HTTP redirection to "https://myblog.blogspot.com/search/label/ASP.Net".
Search engines can only pass page rankings and other relevant data through a single redirection hop. Using unnecessary redirects can have a negative impact on page ranking.

I searched on net and I am feeling like to set either custom robot.txt file to disable crawling of http pages or may be I have to set 301 permanent redirect. Either way can anybody suggest how to do this in blogger/blogspot.