Werk #11354: Crash in service dropdown of interfaces without IP

Component	Ntopng integration
Title	Crash in service dropdown of interfaces without IP
Date	Mar 9, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

For interfaces which do not have an IP address, the service dropdown crashed in case ntop was configured. This is fixed now.

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