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-16432-6.0 to release/6.0

* commit '23a65172fdef97a4c404ce7e2b2d8274364b4e8b':
  A......... [ZBX-16432] fixed code style
  .......... [ZBX-16432] Selenium tests, changed max-length value
  A.F....... [ZBX-16432] fixed the wrong possibility to import graph with empty name and added proper max-length to graph name field