[TYPO3-core] RFC: #14327: Condition misses check for no logged in user

[Steffen Kamper]

This is a SVN patch request.

Type: bugfix / mini-feature

Bugtracker references:
http://bugs.typo3.org/view.php?id=14327

Branches:
Trunk

its possible to check for any logged in user with
[loginUser = *]
or specified
[loginUser = 2,3]
but not the negative if no user is logged in.

If using the check alone it would be possible to do this in else
[loginUser = *]
[else]
#no user is logged in
[end]

but if you combine conditions, eg checking for wrong login data, it's 
not possible.

Attached patch solve this by allow empty string for not logged in user
[loginUser = ]

so you can combine it like
[loginUser = ] && [globalVar = GP:logintype = login]
page.100 = TEXT
page.100.value = Wrong login data
[end]
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