[backport] fix: dashboard image not get set in downstream due to devFlags conf (#1224)

[zdtsw]

Description

• if DSC CR has old format with empty devFlag:{}, it can cause downstream image not replace but run with quay.io one

Signed-off-by: Wen Zhou [email protected]
(cherry picked from commit 1dbe269)

https://issues.redhat.com/browse/RHOAIENG-12300

How Has This Been Tested?

Screenshot or short clip

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[VaishnaviHire]

/lgtm

[openshift-ci]

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