SteemMakers article does not load when no image in article

I read an article about progress being made on the SteemMakers project on @jefpatat's blog and decided to take a look at the site. I noticed there's an issue on the homepage with the first article that doesn't show a preview. When you navigate to the site at www.steemmakers.com you can see the issue immediately. It takes a while to load the posts but the first post keeps loading. I tried to find more info and apparently some of the script fails because image is not defined, which seems to be caused by the article not having an image.

In summary:
Error: no preview is shown and the spinner keeps being shown. I add a screencast of the issue with the error in the console:

Expected result: show a textual preview of the article even if there is no image.

Browser information:
Opera desktop:
Version: 49.0.2725.64 (PGO) - Opera is up to date
Update stream: Stable
System: Windows 8.1 64-bit