Fixed undefined index site_url in email.php
Fixed undefined index site_url in email.php

lionixevolve/LionixCRM,pribeiro42/SuiteCRM,MikeyJC/SuiteCRM,lionixevolve/SuiteCRM,gody01/SuiteCRM,samus-aran/SuiteCRM,horus68/SuiteCRM-Horus68,JimMackin/SuiteCRM,lionixevolve/LionixCRM,lionixevolve/LionixCRM,ChangezKhan/SuiteCRM,MikeyJC/SuiteCRM,salesagility/SuiteCRM,ChangezKhan/SuiteCRM,MikeyJC/SuiteCRM,ChangezKhan/SuiteCRM,JanSiero/SuiteCRM,gody01/SuiteCRM,salesagility/SuiteCRM,horus68/SuiteCRM-Horus68,salesagility/SuiteCRM,pribeiro42/SuiteCRM,samus-aran/SuiteCRM,pribeiro42/SuiteCRM,JanSiero/SuiteCRM,JimMackin/SuiteCRM,gody01/SuiteCRM,Dillon-Brown/SuiteCRM,MikeyJC/SuiteCRM,JanSiero/SuiteCRM,Dillon-Brown/SuiteCRM,lionixevolve/LionixCRM,ChangezKhan/SuiteCRM,lionixevolve/SuiteCRM,pribeiro42/SuiteCRM,Dillon-Brown/SuiteCRM,gody01/SuiteCRM,lionixevolve/SuiteCRM,salesagility/SuiteCRM,samus-aran/SuiteCRM,JimMackin/SuiteCRM,lionixevolve/LionixCRM,horus68/SuiteCRM-Horus68,horus68/SuiteCRM-Horus68,lionixevolve/LionixCRM,Dillon-Brown/SuiteCRM,lionixevolve/SuiteCRM,samus-aran/SuiteCRM,JanSiero/SuiteCRM,JimMackin/SuiteCRM