Check upgrade manifest can be read before attempt to load
Check upgrade manifest can be read before attempt to load

prevent 500 error when manifest is missing ior cannot be read

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