Address NullPointerException if the users has not specified a baseline hash for directory#675

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dennis-behm:feature/674-exception-in-case-no-user-supplied-baseline-ref-is-returned-by-the-utility-methoddennis-behm/dbb-zappbuild:feature/674-exception-in-case-no-user-supplied-baseline-ref-is-returned-by-the-utility-methodCopy head branch name to clipboard