When an exception occurs during open the lock file is not unlocked

[Apollon77]

If you open the DB and theis fails e.g. because of invalid data in a line (and not using ignore errors) then this fails. But it do not unlock the lock file. a Close will also not unlock the lockfile because _isOpen is still false (because DB was never really open).

Relates to ioBroker/ioBroker.admin#1833 (comment)

For the "iob fix" command the plan was to use open without ignoreError, then catch an error, log a line and open DB with "ignoreErrors" ... but this fails because of lockfile is still there and locked