Empty FSS flags should not be defaulted on vanilla clusters

[rikatz]

What this PR does / why we need it: This PR removes the defaulting of feature flags namespace and configmap flags when they are empty, not enforcing the need of the FSS flags on vanilla clusters

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Testing done: TBD on running cluster

Special notes for your reviewer:

Release note:

FSS flags are not defaulted on vanilla clusters