refs isn't necessarily a list of tuples.

There are some cases, can't recall exactly what they are, where a
single ref is returned instead of a ref, class info tuple.

src/scripts/fsrefs.py

@@ -77,7 +77,13 @@ def main(path):
             
         refs = get_refs(data)
         missing = [] # contains 3-tuples of oid, klass-metadata, reason
-        for ref, klass in refs:
+        for info in refs:
+            try:
+                ref, klass = info
+            except TypeError:
+                # failed to unpack
+                ref = info
+                klass = '<unknown>'
             if not fs._index.has_key(ref):
                 missing.append((ref, klass, "missing"))
             if noload.has_key(ref):