This PR fix the error that cannot import all no annotation books when 'not export no annotation book' is unset.
If the value of notExportNoAnnotation is false, all books will be loaded from the database,
but if the condition annotation.length === 0 is met, the required book will still be discarded.
This PR fix the error that cannot import all no annotation books when 'not export no annotation book' is unset.
If the value of notExportNoAnnotation is false, all books will be loaded from the database, but if the condition
annotation.length === 0
is met, the required book will still be discarded.