release-19.4:Backport!1571

Merged Andrey Vertiprahov requested to merge cherry-pick-1f3a3471 into release-19.4

noc/noc#1216 Dahua.DH.get_version. Fix script on cam without PTZ module.

See merge request !3174 (merged)

(cherry picked from commit 1f3a3471)

4f7d378c Dahua.DH.get_version. Fix script on cam without PTZ module.

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