Check if hljs is defined
Check if hljs is defined

Really fixes #107 and #108
maximebf/php-debugbar,maximebf/php-debugbar,PatidarWeb/php-debugbar,DanPhyxius/php-debugbar,Big-Shark/php-debugbar,reignHay/debugbar,getgrav/php-debugbar,getgrav/php-debugbar,PatidarWeb/php-debugbar,stefandoorn/php-debugbar,getgrav/php-debugbar,DanPhyxius/php-debugbar,reignHay/debugbar,DanPhyxius/php-debugbar,stefandoorn/php-debugbar,DanPhyxius/php-debugbar,Big-Shark/php-debugbar,stefandoorn/php-debugbar,PatidarWeb/php-debugbar,Big-Shark/php-debugbar,reignHay/debugbar,reignHay/debugbar,stefandoorn/php-debugbar,Big-Shark/php-debugbar,maximebf/php-debugbar