Allow projects with groups=Nonev1.9.1

Mirror manifest and repo projects are outside the manifest and
have no groups.  Allow project groups to be None for these
projects.

Change-Id: I3e1c4add894fe1c43aa4e77a1fc1558aa10dd191

1 files changed, 2 insertions, 0 deletions

diff --git a/project.py b/project.py
index afab1b7c..4f0345f8 100644
--- a/project.py
+++ b/project.py
@@ -666,6 +666,8 @@ class Project(object):
        manifest_groups: "-group1,group2"
        the project will be matched.
     """
+    if self.groups is None:
+      return True
     matched = False
     for group in manifest_groups:
       if group.startswith('-') and group[1:] in self.groups: