#1339 K3.0: Purge Re: Prefixes gives weird error message
#1346 K3.0: Undefined property: KunenaAdminViewCategories::$sidebar
Merge pull request #1353 from mahagr/master

Merge all changes from Kunena 2.0.4 final release
Merge pull request #1351 from xillibit/k30_bugs5

#1346 K3.0: Undefined property: KunenaAdminViewCategories::$sidebar
Merge pull request #1350 from xillibit/k30_bugs3

#1339 K3.0: Purge Re: Prefixes gives weird error message