Zabbix

A......... [ZBX-16604] fixed occurrence of an undefined index in discovered graph configuration

* commit '65bd8212bc219ed5a66219844164cbfcae02b531':
  A......... [ZBX-16604] fixed occurrence of an undefined index in discovered graph configuration

(cherry picked from commit 0b3366b83c2c48cf504d812d7f2512ab38516445)
(cherry picked from commit c5a22eeaa401301f4740a45a00dbf17fc970be05)
(cherry picked from commit e6c52e64b1ed4521237ade351dabd9e0a4f3b85e)