DB Error upgrade from OJS 3.0.2 to OJS 3.1.0.1

Hi @Taz,

See e.g. BUG after upgrade 3.0.2 to 3.1.0.1 (menu bar is missing) - #5 by rafaelmansilha for a description of the cause of the unserialize notices.

Regards,
Alec Smecher
Public Knowledge Project Team