`description` is optional in the request schema, but the column is
NOT NULL with no default, so an omitted description reached Prisma as
undefined and the create threw a validation error instead of saving:
Invalid `prisma.board.create()` invocation
Argument `description` is missing.
Default it to an empty string, matching what the UI sends today, and
cover it with an API test.
brantsrasmus
8d2938eddb