fix: check CpUtil.getName parameter

Looks like this function is called with a number in
place of the vehicle during the game load sometime.

Since this is called every time we are logging the
vehicle's name, we have no idea which is the bad call.

Add a check and print the callstack so we can identify
the location. This will also mask the error, so if there
is no other problem, people will not report it, and we'll
never find out...

Author: Peter Vaiko

scripts/CpUtil.lua

@@ -118,6 +118,10 @@ function CpUtil.getName(object)
 	if object == CpUtil then
 		return 'ERROR, calling CpUtil.getName with : !'
 	end
+	if type(object) ~= 'table' then
+		printCallstack()
+		return 'ERROR, calling CpUtil.getName with a non-table: ' .. tostring(object)
+	end
 	local helperName = '-'
 	if object == object.rootVehicle then
 		helperName = object.id