Werk #7906: Fix possible AttributeError "'NoneType' has no attribute 'delete_session'" on SNMP hosts

Component	Inline SNMP
Title	Fix possible AttributeError "'NoneType' has no attribute 'delete_session'" on SNMP hosts
Date	Jul 3, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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