Werk #7972: Fix possible error when checking on command line with missing piggyback_sources directory

Component Core & setup
Title Fix possible error when checking on command line with missing piggyback_sources directory
Date Jul 12, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b4 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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