[FIX] objects: array_fill blows up if given an empty array (was happening from the breadcrumb module on a new session)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52933 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] trackers: Mysteriously uninitialised array (since before tiki 9?), threw errors sometimes using perspectives when now set.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52934 b456876b-0849-0410-b77d-98878d47e9d5