Reproduction steps

1. Create a stash using git_stash_save with default options.
2. use git show stash@{0} in command line
3. There are no diffs for the stash

Expected behavior

The expected behavior is that the stashed diffs are visible in command line.

Actual behavior

The diffs are not visible via command line.

Version of libgit2 (release number or SHA1)

37dba1a

Operating system(s) tested

Linux, Mac OSX