Fixed editor error handling
Fixed editor error handling

refs https://github.com/TryGhost/Admin/commit/adeef741fb235b74f2c0e011f94075a80e2151e4

- there's no local `error()` action, we need to use `this.send()` so the route-level error handler is triggered

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost