ii: fix a bug that search isn't returned long time
ii: fix a bug that search isn't returned long time

GitHub: #548

[groonga-dev,04028]

We should not use "jump" value for deleted record.

It may fix the reported problem with this change.

Reported by Atsushi Shinoda. Thanks!!!

naoa/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,komainu8/groonga,cosmo0920/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,cosmo0920/groonga,naoa/groonga,kenhys/groonga,groonga/groonga,cosmo0920/groonga,komainu8/groonga,kenhys/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,naoa/groonga,naoa/groonga,groonga/groonga,cosmo0920/groonga,groonga/groonga,komainu8/groonga,naoa/groonga,kenhys/groonga,naoa/groonga,cosmo0920/groonga,kenhys/groonga,komainu8/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga