Allow importing modules without a Koji tag

These module builds will basically act as metadata-only module builds.
This will be more useful as additional features stem from these types
of builds.

tests/scm_data/mariadb/objects/60/5345608fcc41d4e297cf062c653ebfdfe52476

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tests/scm_data/mariadb/objects/7f/96fc61223e4bc4c93c7c286cca98f6efaa3716

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tests/scm_data/mariadb/objects/e9/742ed681f82e3ef5281fc652b4e68a3826cea6

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tests/scm_data/mariadb/objects/f7/c5c7218c9a197d7fd245eeb4eee3d7abffd75d

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tests/scm_data/mariadb/refs/heads/master

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