release-19.3:Backport!2864

Merged Andrey Vertiprahov requested to merge cherry-pick-962a9511 into release-19.3

Rotek.RTBS.get_interfaces. Fix traceback when unknown iface type.

See merge request !2864 (merged)

(cherry picked from commit 962a9511)

f12e3912 Rotek.RTBS.get_interfaces. Fix traceback when unknown iface type.

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