Terry Flores Former “SpongeBob SquarePants” storyboard artist John Trabbic III had just gotten a greenlight from Nickelodeon for his own animated series, “Middlemost Post,” about a rain cloud that just wants to make everyone happy, when the coronavirus pandemic hit, forcing Nick to close the studio’s doors and send all its artists home. But instead of putting production on “Middlemost Post,” or most of its other animated shows, on hold, Nick brass outfitted the staffs with the tools they’d need