Werk #6958: Check_MK Check: Don't crash upon keepalive timeout

Component	Checks & agents
Title	Check_MK Check: Don't crash upon keepalive timeout
Date	Jan 18, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p12 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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