Werk #12922: Fix crash in parsing netapp agent output

Component	Checks & agents
Title	Fix crash in parsing netapp agent output
Date	Jun 1, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p25 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

A crash occured during discovery while parsing netapp agent output. This is now fixed.

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