Re: [PATCH v2 2/3] diff-files: fix incorrect usage of an empty tree

"Johannes Schindelin via GitGitGadget" [off-list ref]
writes:

From: Johannes Schindelin <redacted>

In c26022ea8f5 (diff: convert diff_addremove to struct object_id,
2017-05-30), the OID to use for intent-to-add files was inadvertently
changed from the empty blob to the empty tree.

Well spotted.  Regardless of the other two patches, this is
absolutely the right thing to do.  It is quite embarrassing
that nobody noticed the typo so far.