Fix broken commits search

app/controllers/search_controller.rb

@@ -16,7 +16,7 @@ class SearchController < ApplicationController
       @group = nil unless can?(current_user, :read_group, @group)
     end
-    return if params[:search].nil? || params[:search].blank?
+    return if params[:search].blank?
     @search_term = params[:search]

app/views/search/results/_commit.html.haml

-= render 'projects/commits/commit', project: @project, commit: commit
+= render 'projects/commits/commit', project: @project, commit: commit, ref: nil

changelogs/unreleased/24255-search-fix.yml

+---
+title: Fix broken commits search
+merge_request: 
+author: 

spec/features/global_search_spec.rb

+require 'spec_helper'
+
+feature 'Global search', feature: true do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, namespace: user.namespace) }
+
+  before do
+    project.team << [user, :master]
+    login_with(user)
+  end
+
+  describe 'I search through the issues and I see pagination' do
+    before do
+      allow_any_instance_of(Gitlab::SearchResults).to receive(:per_page).and_return(1)
+      create_list(:issue, 2, project: project, title: 'initial')
+    end
+
+    it "has a pagination" do
+      visit dashboard_projects_path
+
+      fill_in "search", with: "initial"
+      click_button "Go"
+
+      select_filter("Issues")
+      expect(page).to have_selector('.gl-pagination .page', count: 2)
+    end
+  end
+end

spec/features/search_spec.rb

@@ -100,6 +100,32 @@ describe "Search", feature: true  do
       expect(page).to have_link(snippet.title)
     end
+
+    it 'finds a commit' do
+      visit namespace_project_path(project.namespace, project)
+
+      page.within '.search' do
+        fill_in 'search', with: 'add'
+        click_button 'Go'
+      end
+
+      click_link "Commits"
+
+      expect(page).to have_selector('.commit-row-description')
+    end
+
+    it 'finds a code' do
+      visit namespace_project_path(project.namespace, project)
+
+      page.within '.search' do
+        fill_in 'search', with: 'def'
+        click_button 'Go'
+      end
+
+      click_link "Code"
+
+      expect(page).to have_selector('.file-content .code')
+    end
   end
   describe 'Right header search field', feature: true do

spec/spec_helper.rb

@@ -29,6 +29,7 @@ RSpec.configure do |config|
   config.include Devise::Test::ControllerHelpers,   type: :controller
   config.include Warden::Test::Helpers, type: :request
   config.include LoginHelpers,          type: :feature
+  config.include SearchHelpers,         type: :feature
   config.include StubConfiguration
   config.include EmailHelpers
   config.include TestEnv

spec/support/search_helpers.rb

+module SearchHelpers
+  def select_filter(name)
+    find(:xpath, "//ul[contains(@class, 'search-filter')]//a[contains(.,'#{name}')]").click
+  end
+end