Zabbix

..F....... [ZBX-21889] fixed warnings shown even if overrides are enabled for compressed chunks

* commit 'e46e0b2f56f876f16ec54ad10b48a3d6c10f6615':
  ..F....... [ZBX-21889] modified override check to happen in helper
  ..F....... [ZBX-21889] fixed undefined index
  ..F....... [ZBX-21889] fixed warnings being shown even when overrides are enabled for trends or history tables with compressed chunks