Zabbix

..F....... [ZBX-21322] fixed runtime error in Graph widget

* commit '99f6168a0367741c3828c77210f37cb2fa4bccfb':
  ..F....... [ZBX-21322] fixed validation for aggregate interval
  ..F....... [ZBX-21322] fixed runtime error in graph widget graph preview process
  ..F....... [ZBX-21322] added default value to validation field; fixed code style
  ..F....... [ZBX-21322] fixed runtime error in Graph widget