Sorry for the brief answer, but it's a hard one to expand on. I've not seen any indication that this was something people worried about at all, beyond "don't point the pointy end at your mates." Compared to firearms, hand weapons are pretty difficult to accidentally injure yourself or others with (you can't drop a sword and have it go off and kill someone 50 feet away), and yet early modern armies equipped with firearms took very minimal (at best) precautions. War is inherently a dangerous endeavor, and this particular risk factor just doesn't seem to have been the cause of much concern.