Zabbix

..F....... [ZBX-21883] changed map widgets select map field to multiselect

* commit '3c4d6011747a583c1f93abffd550e320248c8b80':
  ..F....... [ZBX-21883] fixed code style
  ..F....... [ZBX-21883] fixed map name field, if empty, not being populated when selecting map using multiselect
  ..F....... [ZBX-21883] fixed PHP runtime error when remove linked "Map navigation tree" widget
  ..F....... [ZBX-21883] fixed coding style
  .D........ [ZBX-21883] added ChangeLog entry
  ..F....... [ZBX-21883] fixed JS error when trying to add Map tree element without map
  ..F....... [ZBX-21883] backported from feature/ZBX-21883-6.4