Workaround for ZBX-7420

A fix to workaround ZBX-7420 (https://support.zabbix.com/browse/ZBX-7420) in later 2.0/2.2 releases which cause inventory to not be displayed via the API (and subsequently not make location data available)
Merge pull request #1 from ggiesen/master

Workaround for ZBX-7420