Werk #10744: mssql_blocked_sessions: don't crash in clustered setup

Component	Checks & Agents
Title	mssql_blocked_sessions: don't crash in clustered setup
Date	Jan 31, 2020
Checkmk Editon	Checkmk Raw (CRE)
Checkmk Version	2.0.0i1 1.6.0p9
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed

In a clustered setup the mssql_blocked_sessions check plugin crashed if an instance is moved from one node to another and one node reported blocked sessions while the other node did not. This is fixed.

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