`git_diff_from_buffer` fails to parse a diff file containing an empty file

Reproduction steps:
Calling git_diff_from_buffer when the diff file contains deletion/creation of an empty file.
Call git_diff_from_buffer with the following diff file:

diff --git a/patchFolder/deleteFile.txt b/patchFolder/deleteFile.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/patchFolder/modifyFile.txt b/patchFolder/modifyFile.txt
index ce01362..14be0d4 100644
--- a/patchFolder/modifyFile.txt
+++ b/patchFolder/modifyFile.txt
@@ -1 +1 @@
-hello
+hello2

Same happens with:

diff --git a/emptyfile2 b/emptyfile2
new file mode 100644
index 0000000..e69de29

Expected behavior:
Proper git_diff object. Command line version of git has no problem with the diff file.
Actual behavior:
Error code -1, git_diff null.

Version of libgit2 (release number or SHA1)
1.1.0-1
Operating system(s) tested
Arch linux

Start by locating the git_diff_from_buffer entry point and reproduce the supplied deletion and creation diffs for empty files. Compare the result with the non-empty-file diff behavior; done means both empty-file cases return a proper git_diff object instead of error code -1 and null.