Allow SaveImagesCmd to omit image tags - #2660
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Fixes #1872
What was wrong
SaveImagesCmd documents that an image can be saved without an explicit tag, but withImage(name, tag) rejected a null tag and always formatted images as name:tag. That made the documented name-only form unusable.
What changed
The tag argument is now nullable. TaggedImage.asString() returns the image name alone when no tag is supplied and keeps the existing name:tag form for tagged images. A small unit test covers both forms without requiring a Docker daemon.
Testing
The full reactor test command reaches Docker-dependent transport tests, but no Docker daemon is available in this environment, so that part could not run.