If, with the term 'warn' you mean a personal message: no, I didn't receive any warn. But if you mean a message visible for all players in the main chat, I don't remeber. To be honest, that was not my 1st thrown over the wall, but you know ..... with no warnings .... I supposed it was ok.
But I'm sure a teammate of mine did the same thing some minutes before me, but I don't know if he was warned or even kicked.
Anyway thank you