Werk #11644: PySNMP: Cannot convert 'NoneType' object to bytes

Component	Core & setup
Title	PySNMP: Cannot convert 'NoneType' object to bytes
Date	Nov 9, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The context_name interface uses None as value but PySNMP can't handle the context_name None. As default value it needs "" (empty string).

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