Default message when there is a problem with your template I receive a lot of questions about why display templates are not working or why managed properties do not contain a value. Most of the times the solution is similar to what has been already asked before, so I thought of writing this down in order that it can help everyone with similar issues.
A client of mine is currently undergoing a migration from SharePoint 2007 to 2013. An important part of their migration is a blog site. This blog is used all over the company to spread news to the colleagues. Everything went fine during the migration process of the blog, but from the moment they started testing the functionality they saw some weird behaviour.