desc: 1001 (null + between + sindexes)
tests:
  - rb: r.table_create('1001')
    def: tbl = r.table('1001')

  - rb: tbl.insert({:a => nil})
  - rb: tbl.index_create('a')
  - rb: tbl.index_create('b')

  - rb: tbl.between(nil, nil).count
    ot: 1
  - rb: tbl.between(nil, nil, :index => :a).count
    ot: 0
  - rb: tbl.between(nil, nil, :index => :b).count
    ot: 0

  - rb: r.table_drop('1001')
