* fix: skip service container for empty image
It is used to skip empty image name in services which is the only way to handle condition services in github action currently https://github.com/actions/runner/issues/822
* test: add testdata for empty image in services
* fix: add missing test call
* fix: wring test call
* fix: invalid without expression
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Co-authored-by: ChristopherHX <christopher.homberger@web.de>