fix label issue

lib/gitlab/import_export/relation_factory.rb

@@ -139,13 +139,12 @@ module Gitlab
       end
 
       def setup_label
-        return unless @relation_hash['type'] == 'GroupLabel'
-
         # If there's no group, move the label to a project label
-        if @relation_hash['group_id']
+        if @relation_hash['type'] == 'GroupLabel' && @relation_hash['group_id']
           @relation_hash['project_id'] = nil
           @relation_name = :group_label
         else
+          @relation_hash['group_id'] = nil
           @relation_hash['type'] = 'ProjectLabel'
         end
       end

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -236,12 +236,14 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
       labels = project.issues.first.labels
 
       expect(labels.where(type: "ProjectLabel").count).to eq(results.fetch(:first_issue_labels, 0))
+      expect(labels.where(type: "ProjectLabel").where.not(group_id: nil).count).to eq(0)
     end
   end
 
   shared_examples 'restores group correctly' do |**results|
     it 'has group label' do
       expect(project.group.labels.size).to eq(results.fetch(:labels, 0))
+      expect(project.group.labels.where(type: "GroupLabel").where.not(project_id: nil).count).to eq(0)
     end
 
     it 'has group milestone' do