evert/SabreDAV — pull request #29 by PHPGangsta (2012-06-12 14:59:38+00:00)
Title: test and bugfix for google code issue #220 (Warning "Invalid argument su...

...pplied for foreach" in CalendarQueryValidator)

Testing against "null" fixes the issue, I don't know if there is a better way (isset() or so).
Please backport to 1.6

Thanks!
Michael