Error on remoteStorage.local.reset()

I was trying to delete local storage without reloading the page (in init step of my tests), so I tried to call `remoteStorage.local.reset()`, but it throws an error :
    other is null

It seems to come from `https://github.com/remotestorage/remotestorage.js/blob/master/src/indexeddb.js#L153` : the first parameter of the callback should be the error message, not the DB.