Werk #10620: Fix parsing of invalid state history files

Component	Core & setup
Title	Fix parsing of invalid state history files
Date	Feb 17, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p9 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p25 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

To the list of all Werks