Werk #4366: Fixed random exception related to html.unplug() in GUI

Component	User interface
Title	Fixed random exception related to html.unplug() in GUI
Date	Feb 15, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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