Werk #7460: HW/SW inventory: Avoid saving empty inventory trees

Component	HW/SW inventory
Title	HW/SW inventory: Avoid saving empty inventory trees
Date	May 13, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p17 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previously empty inventory trees were stored. The consequence might be that HW/SW archive entries were produced.

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