use NULL commit callback in svn_repos_get_commit_editor5?

Hi dev,

I see that it is mandatory to pass a non-NULL commit callback function
for svn_repos_get_commit_editor5, since otherwise a
editor->close_edit(..) aborts with a segmentation fault :(

Writing a C test, I just wanted nothing to happen when the commit is
done, but still had to write a dummy commit callback that does nothing
to avoid the segmentation fault.

Am I not getting something?

Thanks

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