include changes from https://www.wowinterface.com/downloads/info21484-GnomishVendorShrinkerFanUpdateforBFAGVS.html and fix classic issues

externals/size_to_fit.lua

@@ -29,5 +29,7 @@ function ns.SizeToFit(self)
 
 	-- Now resize ourself
 	local _, _, width, height = self:GetBoundsRect()
-	self:SetSize(width, height)
+		if(width ~= nil and height ~= nil) then
+		self:SetSize(width, height)
+	end
 end

externals/ui-scrollbar.lua

@@ -32,7 +32,7 @@ end
 
 
 local function Sound()
-	PlaySound("UChatScrollButton")
+	PlaySound(1115)
 end