[wp-xmlrpc] possible bug: deleteComment, etc say you're not authorized when comment doesn't exist

[Ryan B]

hi wp-xmlrpc! i noticed an odd behavior today with a few methods like
deleteComment and editComment. if you give them a nonexistent comment
id, they say "you're not allowed to moderate this comment," even when
you are allowed. it seems like they should say the comment doesn't
exist. this seems like a bug, since deletePage, etc do tell you that
the page doesn't exist.

can you all confirm? if so, i'll gladly send the patch, it's pretty
trivial. thanks!

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