Werk #11009: Fixed possible ValueError while searching for werk id in release notes

Component	User interface
Title	Fixed possible ValueError while searching for werk id in release notes
Date	Apr 1, 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 1.6.0p11 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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