Werk #8875: View editor: Fixed handling of invalid user input

Component	User interface
Title	View editor: Fixed handling of invalid user input
Date	Aug 23, 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) 1.6.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Fixed a case where invalid user input could lead to a crash in the view editor.

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