[FIX] Use get_perspective to check existance so permissions are checked

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46963 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] convene: Remove incorrect js include which moved during the composer changes and gets included elsewhere

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46966 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/11.x 46961 to 46966

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46967 b456876b-0849-0410-b77d-98878d47e9d5