Fix error in generating labels

Attempting to generate default set of labels would result in
an error:

ArgumentError: wrong number of arguments (given 1, expected 0)

Closes #23649

CHANGELOG.md

@@ -10,6 +10,9 @@ Please view this file on the master branch, on stable branches it's out of date.
 
   - Use MergeRequestsClosingIssues cache data on Issue#closed_by_merge_requests method
 
+## 8.13.1 (unreleased)
+  - Fix error in generating labels
+
 ## 8.13.0 (2016-10-22)
 
   - Fix save button on project pipeline settings page. (!6955)

lib/gitlab/issues_labels.rb

@@ -19,7 +19,7 @@ module Gitlab
         ]
 
         labels.each do |params|
-          ::Labels::FindOrCreateService.new(project.owner, project).execute(params)
+          ::Labels::FindOrCreateService.new(project.owner, project, params).execute
         end
       end
     end

spec/controllers/projects/labels_controller_spec.rb

@@ -70,4 +70,19 @@ describe Projects::LabelsController do
       get :index, namespace_id: project.namespace.to_param, project_id: project.to_param
     end
   end
+
+  describe 'POST #generate' do
+    let(:admin) { create(:admin) }
+    let(:project) { create(:empty_project) }
+
+    before do
+      sign_in(admin)
+    end
+
+    it 'creates labels' do
+      post :generate, namespace_id: project.namespace.to_param, project_id: project.to_param
+
+      expect(response.code).to eq(302)
+    end
+  end
 end