Merge branch 'update-gitlab-git' into 'master'

Update gitlab_git & use new method for counting branches

Corresponding gitlab_git merge request detailing some of the rationale behind this: https://gitlab.com/gitlab-org/gitlab_git/merge_requests/62

Fixes #12418 

See merge request !2535

Gemfile.lock

@@ -356,7 +356,7 @@ GEM
       posix-spawn (~> 0.3)
     gitlab_emoji (0.2.0)
       gemojione (~> 2.1)
-    gitlab_git (7.2.23)
+    gitlab_git (7.2.24)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.7.3)
       github-linguist (~> 4.7.0)

app/models/repository.rb

@@ -57,7 +57,7 @@ class Repository
   # This method return true if repository contains some content visible in project page.
   #
   def has_visible_content?
-    !raw_repository.branches.empty?
+    raw_repository.branch_count > 0
   end
 
   def commit(id = 'HEAD')

spec/models/repository_spec.rb

@@ -219,4 +219,24 @@ describe Repository, models: true do
       end
     end
   end
+
+  describe '#has_visible_content?' do
+    subject { repository.has_visible_content? }
+
+    describe 'when there are no branches' do
+      before do
+        allow(repository.raw_repository).to receive(:branch_count).and_return(0)
+      end
+
+      it { is_expected.to eq(false) }
+    end
+
+    describe 'when there are branches' do
+      before do
+        allow(repository.raw_repository).to receive(:branch_count).and_return(3)
+      end
+
+      it { is_expected.to eq(true) }
+    end
+  end
 end