Running status command after MemoryMigrationSource fails

[ralfthewise]

The failure is:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x10 pc=0x40b8b7]

goroutine 1 [running]:
panic(0x8b3bc0, 0xc820010160)
    /usr/local/go/src/runtime/panic.go:464 +0x3e6
main.(*StatusCommand).Run(0xe64ee8, 0xc82000a5d0, 0x0, 0x0, 0x9e0718)
    /home/tim/dev/go/src/github.com/rubenv/sql-migrate/sql-migrate/command_status.go:86 +0xb87
github.com/mitchellh/cli.(*CLI).Run(0xc8203ee000, 0xc820012510, 0x0, 0x0)
    /home/tim/dev/go/src/github.com/mitchellh/cli/cli.go:153 +0x56e
main.realMain(0xc820000180)
    /home/tim/dev/go/src/github.com/rubenv/sql-migrate/sql-migrate/main.go:39 +0x39e
main.main()
    /home/tim/dev/go/src/github.com/rubenv/sql-migrate/sql-migrate/main.go:11 +0x18

Perhaps since those records exist in the database (even though they doen't in the file system) we should just consider then as Migrated = true and add a new row?