Werk #7015: Fixed broken pattern analyzer when only matching a logfile without host name

Component	Setup
Title	Fixed broken pattern analyzer when only matching a logfile without host name
Date	Dec 19, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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