improve optionals packageUrl and serverCheckUrl parameters initialization
improve optionals packageUrl and serverCheckUrl parameters initialization

MingJen/phpfreechat,kerphi/phpfreechat,bright-sparks/phpfreechat,MingJen/phpfreechat,jahanzaibbahadur/phpfreechat,MingJen/phpfreechat,bright-sparks/phpfreechat,jahanzaibbahadur/phpfreechat,kerphi/phpfreechat,jahanzaibbahadur/phpfreechat,bright-sparks/phpfreechat