Werk #10620: Fix parsing of invalid state history files

Component Core & setup
Title Fix parsing of invalid state history files
Date Feb 17, 2020
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.5.0p25 1.6.0p9 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

State history files missing the EOF would crash CMC shortly after start.

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