Werk #7951: check_mk: Don't crash upon missing hostname

Component	Checks & agents
Title	check_mk: Don't crash upon missing hostname
Date	Jul 17, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The check_mk service no longer crashes if the host the linux agent is run on does not provide the 'hostname' command.

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