Does any buddhist school, extant or otherwise, say that there is no svabhava what-so-ever?

Does any buddhist school, extant or otherwise, say that there is no *svabhava* what-so-ever? I was thinking maybe an early school without the abhidahrma (mahasanghika) or perhaps prasangika-yogaraca in which non duality and convention / absolute emptiness is all there is. However, do these schools say that there is no essence?