Merge branch 'handle_00_shas' of https://github.com/ciaranj/node-git …

…into ciaranj-handle_00_shas

lib/git/pack_storage.js

@@ -246,7 +246,7 @@ var unpack_compressed = function(pack, offset, destsize) {
 var find_object_in_index = function(pack, idx, sha1) {
   // Parse the first value of the sha as an index
   var slot = sha1.charCodeAt(0);
-  if(!slot) return null;
+  if(slot == NaN) return null;
 
   // Unpack the variables
   var first = pack.offsets[slot];