Fusion was just a "house" brand name that Haro used for the generic parts that they put on their complete bikes, Google Haro Fusion and you will get hit on a variety of things that were branded that way. As with most house brand stuff, it was non-spectacular and you would not see much of it available as after market pieces. I did see one Haro Fusion Sprocket that looked pretty cool on an old school race bike last year, it was a two piece design with the center in an anodized blue colour, nothing like the one you have.
While you may have an attachment to that sprocket, it looks like a pretty run of the mill item that could easily be replaced with something new for 25 bucks.
It is possible that this was on a bike with one piece cranks and the pin on the drive side crank just butted up against one of the cut outs so there wasn't a hole. I have seen that on childrens bikes in the past, if that was what you had then the bike shop was doing you a favour. That design would mean that the sprocket would be free to slip backward if you let the bike roll back at all. Drilling a hole that would actually secure the pin of a one piece crank in both directions or allow the sprocket to be secured to a 3 piece crankarm would actually be an upgrade of sorts, not something to be "pissed" about.