I see no errors and the debug.log file remains empty. At the same time I am able to create and edit a new Content Template, but the crashed one does not display, even if duplicated.
The issue here is that the content template may have become corrupted.
I did try however to restore as much of the template that I could but some of the elements will need to be rebuilt as i've removed them from the content template through the database.
This should however get your content template working again.