[FIX] Show error and workaround in case pretty tracker references are not replaced (seems like might be tough to fix)


git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@47396 b456876b-0849-0410-b77d-98878d47e9d5
[SEC] Do not store bad values in the session. Thanks Stéphane Casset

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@47397 b456876b-0849-0410-b77d-98878d47e9d5