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BUG: submodule code prints '(null)'

I do not know how to reproduce this (and didn't bother to look deeply
into it after I found it was not a trivial fix) but one of my "git
fetch" showed

warning: Submodule in commit be2db96a6c506464525f588da59cade0cedddb5e
at path: '(null)' collides with a submodule named the same. Skipping

I think it's reported that some libc implementation will not be able
to gracefully handle NULL strings like glibc and may crash instead of
printing '(null)' here. I'll leave it to submodule people to fix this