Werk #6220: df: Fix crashing check for vanished filesystems

Component	Checks & agents
Title	df: Fix crashing check for vanished filesystems
Date	Jun 6, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Up to and including 1.4.0*, df would report UNKNOWN when confronted with a vanished filesystem. A regression in 1.5.0 versions previous to this lead to the check crashing instead. This has been fixed.

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