Integrate gitlab-ci/YT-180-generate-firmware-package-not-working-for-fngsystem

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@a7e07f19

YT-180 Generation of the firmware package failed due to a typo
  in the code that checks of existance of the variable.
  What caused  TypeError: unhashable type: 'list'