Does not raise errors for empty repositories

https://gitlab.com/gitlab-org/gitaly/-/merge_requests/3412
changes the behavior of `Gitaly::FindRemoteRootRefRequest`
for  empty repositories raising an error "no remote HEAD found"
instead of returning a nil value breaking the Geo replication
for empty repositories. This commit handle the error keeping
the old behavior.

ee/app/models/ee/project.rb

@@ -710,6 +710,9 @@ module EE
     def update_root_ref(remote, remote_url, authorization)
       root_ref = repository.find_remote_root_ref(remote, remote_url, authorization)
       change_head(root_ref) if root_ref.present?
+    rescue ::Gitlab::Git::Repository::NoRepository => e
+      ::Gitlab::AppLogger.error("Error updating root ref for project #{full_path} (#{id}): #{e.message}.")
+      nil
     end
 
     override :lfs_http_url_to_repo

ee/spec/models/project_spec.rb

@@ -2178,6 +2178,14 @@ RSpec.describe Project do
         .not_to change { project.default_branch }
     end
 
+    it 'does not raise error when repository does not exist' do
+      allow(project.repository).to receive(:find_remote_root_ref)
+        .with('origin', url, auth)
+        .and_raise(Gitlab::Git::Repository::NoRepository)
+
+      expect { project.update_root_ref('origin', url, auth) }.not_to raise_error
+    end
+
     def stub_find_remote_root_ref(project, ref:)
       allow(project.repository)
         .to receive(:find_remote_root_ref)