PHPCAS-126 Fixed an undefined index notice.
PHPCAS-126 Fixed an undefined index notice.

git-svn-id: cf9c5806888b904cc3267038fbbc1840435af3b8@24950 f5dbab47-78f9-eb45-b975-e544023573eb

mickelfeng/phpCAS,rakesh-mohanta/phpCAS,Jasig/phpCAS,fh/phpCAS,snelg/phpCAS,neopeak/phpCAS,yangchunyong/phpCAS,chand3040/phpCAS