Werk #7899: Fix configuring empty tag ID tags on hosts / folders

Component	Setup
Title	Fix configuring empty tag ID tags on hosts / folders
Date	Jun 26, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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