You can either fire it off without powder, or just run it through the decapping die again. Wear safety glasses and run it up into the die slowly. If you're really concerned about it going off, then you can wrap a heavy towel around the press while you decap it.
boobap,
It's no more of a concern than firing a regular round through the same firearm. Corrosive primers were generally abandoned in the early 1950's in the U. S. Some countries have used them much later, though mostly with Berdan primers.
Hope this helps.
Fred