80106: Merged V4.2-BUG-FIX (4.2.4) to HEAD-BUG-FIX (5.0/Cloud)
79276: Merged DEV to V4.2-BUG-FIX (4.2.4)
77363: MNT-11964 : Users other than admin are unable to start discussion/link/blog.
Added additional permission check for site container, required in case if there are no items created yet.
79160: MNT-11964 : Users other than admin are unable to start discussion/link/blog.
Added tests to simulate the issue.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@82709 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261