Prevent accidental use of protobuf default value for app features (DEV) (#1716)

* Make use of `hasAppFeatures` to prevent accidental use of default values.

* Swap order in if statement to remove unnecessary negation

* Reduce visibility

Co-authored-by: ralfgehrer <mail@ralfgehrer.com>
Co-authored-by: Kolya Opahle <k.opahle@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>