submodule.c: get_super_prefix_or_empty
In a later patch we need to use the super_prefix, and in case it is NULL we can just assume it is empty. Create a helper function for this. We already have some use cases for this helper function, convert them, too. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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