Minor bugs

Signed-off-by: Suki <suki@missallsunday.com>
Fix a flaw, users could realize there are hidden boards...

Signed-off-by: Suki <suki@missallsunday.com>
Add support for guest accounts on BreezeQuery::loadMinimalData()

Signed-off-by: Suki <suki@missallsunday.com>