The question of the classical soul is always looming in the air for the Getty Villa’s annual outdoor drama. Calling upon those classical Greek and Roman plays, one always wonders how academic, how true to form (and perhaps devoid of soul) will the work be? That question is particularly poignant when Anne Bogart and SITI Company are tackling the Greeks, as they are for the third time this year, with Euripides “Bacchae.”