Werk #1289: Fixed missing table headers in hostgroup view

Component	User interface
Title	Fixed missing table headers in hostgroup view
Date	Aug 31, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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