Bugfix: prevent entries without status in anime/manga list

This should fix #161. Entries were saved to the database even if they have no watch/read status. That caused them to show up in the users anime/manga list if the filter was set to show all.

Maybe related fix: Also removed an useless setCreateFlag() as it does not make sense to set the create flag to an entry without read/watch status (the create flag is used to determine if a create request must be sent to the API, which is useless without read/watch status).