release-19.4:Backport!3142

Merged Andrey Vertiprahov requested to merge cherry-pick-5d4fd665 into release-19.4

Dahua.DH. Fix getting config from RVi web cam.

See merge request !3142 (merged)

(cherry picked from commit 5d4fd665)

c1935b27 Dahua.DH. Fix getting config from RVi web cam. 818fb777 Fix black.

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