Gregg Goldstein As the American Film Market enters its second year of online dealmaking, with films like Arclight’s “The Portable Door,” starring Christof Waltz and Sam Neill (pictured above) looking to seal deals in the virtual market, Variety spoke to four veteran film buyers and sellers about how they’ve navigated virtual markets, the lessons they’ve learned, the online platforms they’ve used and what it all will mean for doing business when (and if) the pandemic ends.Kristen FigeroidAfter