Zabbix

..F....... [ZBX-26482] fixed TypeError after deleting datasets in Graph and Pie chart widgets

* commit '99d9c11c2b168d66dc7f733c85a7e70c29c7d0af':
  .......... [ZBX-26482] fixed ChangeLog entry
  ..F....... [ZBX-26482] updated code style
  ..F....... [ZBX-26482] updated code style
  ..F....... [ZBX-26482] fixed TypeError after item from data set in item list was deleted