[core] When slurping an empty file, we should hand back the empty string rather than a NULL, which would suggest an error. Patch courtesy of Ron Schmidt.
[core] When slurping an empty file, we should hand back the empty string rather than a NULL, which would suggest an error. Patch courtesy of Ron Schmidt.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@30981 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot