Werk #7911: Tags: Fix "Element "" does not exist anymore in tag input preview

Component	Setup
Title	Tags: Fix "Element "" does not exist anymore in tag input preview
Date	Jul 5, 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) 1.6.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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