Fixed a bug with bank bags and cooldowns. (#739)

Author: Cidan

widgets/ItemButton.lua

@@ -322,7 +322,9 @@ function buttonProto:Update()
 	end
 	self:UpdateCount()
 	self:UpdateBorder()
-	self:UpdateCooldown(self.texture)
+	if self.UpdateCooldown then
+		self:UpdateCooldown(self.texture)
+	end
 	self:UpdateLock()
 	self:UpdateNew()
 	if addon.isRetail then