export_orig: Don't fail without a repository

This is a valid use case in overlay mode
Thanks: Thomas Koch for the report

1 files changed, 6 insertions, 5 deletions

diff --git a/gbp/scripts/export_orig.py b/gbp/scripts/export_orig.py
index c2885014..13be4f91 100755
--- a/gbp/scripts/export_orig.py
+++ b/gbp/scripts/export_orig.py
@@ -236,12 +236,13 @@ def guess_comp_type(comp_type, source, repo, tarball_dir):
 
     if comp_type == 'auto':
         branch = None
-        if repo.has_branch('pristine-tar'):
-            branch = 'pristine-tar'
-        elif repo.has_branch('origin/pristine-tar', remote=True):
-            branch = 'origin/pristine-tar'
+        if repo:
+            if repo.has_branch('pristine-tar'):
+                branch = 'pristine-tar'
+            elif repo.has_branch('origin/pristine-tar', remote=True):
+                branch = 'origin/pristine-tar'
 
-        if branch:
+        if branch is not None:
             regex = r'pristine-tar .* %s_%s\.orig.tar\.' % (source.name, source.upstream_version)
             commits = repo.grep_log(regex, branch, merges=False)
             if commits: