[TYPO3-core] RFC: Fix bug #6961: Errors in link creation popup window

[Stanislas Rolland]

This is a SVN patch request.

Problem:
Feature #6442: Hook in browse_links request (for linking to records) 
introduced errors in htmlArea RTE link creation popup window when no 
hooks array exists.

Solution:
Check the availability of the hooks array before entering foreach loops.

Bugtracker references:
http://bugs.typo3.org/view.php?id=6961
http://bugs.typo3.org/view.php?id=6442

Branches: Trunk

Regards,
Stanislas
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