Werk #2709: fixed exception when opening the action menu

Component	User interface
Title	fixed exception when opening the action menu
Date	Nov 6, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Opening the action menu would cause an exception if icons have been customized to show in main table.

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