Werk #2295: Fix exception in reporting for views that do not show a host name

Component	Reporting & availability
Title	Fix exception in reporting for views that do not show a host name
Date	May 20, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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