Add a check for empty repos.

coderanger · hvr · commit 2c2193164c4a · 2011-01-22T12:13:18.000+01:00
diff --git a/tracext/git/git_fs.py b/tracext/git/git_fs.py
@@ -599,6 +599,9 @@ class GitChangeset(Changeset):
         } # TODO: U, X, B
 
     def __init__(self, repos, sha):
+        if sha is None:
+            raise NoSuchChangeset(sha)
+        
         try:
             msg, props = repos.git.read_commit(sha)
         except PyGIT.GitErrorSha:
