Werk #1149: check_mk-ibm_svc_systemstats.diskio, check_mk-ibm_svc_systemstats.iops: fix exception in Perf-O-Meter

Component	Checks & agents
Title	check_mk-ibm_svc_systemstats.diskio, check_mk-ibm_svc_systemstats.iops: fix exception in Perf-O-Meter
Date	Aug 28, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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