Zabbix

A.F....... [ZBX-16432] fixed the wrong possibility to import graph with empty name and added proper max-length to graph name field

Merge in ZBX/zabbix from feature/ZBX-16432-5.0 to release/5.0

* commit 'c99a657a5168af682a9e10b5710738829ae7f6fb':
  .......... [ZBX-16432] Selenium tests, changed max-length value
  A.F....... [ZBX-16432] removed unnecessary flag; fixed code style
  A.F....... [ZBX-16432] removed ability to import graph with empty name, added graph name length validation up to 128 characters
  A.F....... [ZBX-16432] removed ability to import graph with empty name, added graph name length validation up to 128 characters and changed changelog
  ..F....... [ZBX-16432] fixed changelog
  ..F....... [ZBX-16432] fixed changelog
  ..F....... [ZBX-16432] fixed the wrong possibility to import graph with empty name and added proper max-length to graph name field