Zabbix

..F....... [ZBX-20196] fixed 'undefined' error in case of broken widget configuration

Merge in ZBX/zabbix from feature/ZBX-20196-6.0 to release/6.0

* commit '6d81a14eeb068b1759e72379a6ef53802c38affe':
  ..F....... [ZBX-20196] fixed 'undefined' error in case of brken widget configuration