I have seen gardening knives shaped like this, I also have a Buck folding serrated blade in this shape. I find it to be a very stong blade.

The edge may also be "safer" as mine has no sharp point, I often use it to cut rope in a marine enviroment where often the rocking of the boat makes using a knive tricky. Rescue knives may also have this rounded point feature to protect both the user and the rescue victim.

Mike