lei blob: fail early if no git dirs

This avoids triggering a "BUG:" message in the solver code.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/PublicInbox/LeiBlob.pm b/lib/PublicInbox/LeiBlob.pm
index 4bd86253..f44d8af1 100644
--- a/lib/PublicInbox/LeiBlob.pm
+++ b/lib/PublicInbox/LeiBlob.pm
@@ -103,6 +103,7 @@ sub lei_blob {
                 my $cgd = get_git_dir('.');
                 unshift(@$git_dirs, $cgd) if defined $cgd;
         }
+        return $lei->fail('no --git-dir to try') unless @$git_dirs;
         my $lxs = $lei->lxs_prepare or return;
         require PublicInbox::SolverGit;
         my $self = bless { lxs => $lxs, oid_b => $blob }, __PACKAGE__;