Ever wondered what that function that came with the patch does, well I found out it.
Well what it does is to prevent the ability from dissapearing when a unit is morphed (Metamorphosis / burrow / submerge / chaos / upgrades)
Blizzard made that function because they needed for the militia nerf, they add call to arms to the first townhall, but if the user starts the upgrade to keep and cancel it, the ability would dissappear. | 
