Werk #10999: fortigate_sslvpn: Fix crash if old-style parameters

Component	Checks & agents
Title	fortigate_sslvpn: Fix crash if old-style parameters
Date	Jun 17, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p14 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If old-style parameters (None) are discovered then the service raises an AttributeError: 'NoneType' object has no attribute 'get'.

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