Support detached HEAD in manifest repositoryv1.6.8.5

If the manifest repository is on a detached HEAD and we are parsing
an XML formatted manifest we should simply set the branch property
to None, rather than crash with an AttributeError.

Signed-off-by: Shawn O. Pearce <sop@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/manifest_xml.py b/manifest_xml.py
index 51e653ed..7d02f9d6 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -183,7 +183,7 @@ class XmlManifest(object):
     if not self._loaded:
       m = self.manifestProject
       b = m.GetBranch(m.CurrentBranch).merge
-      if b.startswith(R_HEADS):
+      if b is not None and b.startswith(R_HEADS):
         b = b[len(R_HEADS):]
       self.branch = b