reafactor common check for not opened database into a StorageImpl.ensureOpened() (for shorter code)
reafactor common check for not opened database into a StorageImpl.ensureOpened() (for shorter code)

kjk/volante-obsolete,ingted/volante,ingted/volante,kjk/volante-obsolete,ingted/volante,kjk/volante-obsolete,kjk/volante-obsolete,ingted/volante