新增：项目是否创建了pr参数

app/views/pull_requests/index.json.jbuilder

@@ -9,6 +9,7 @@ json.user_admin_or_developer @user_admin_or_developer
 json.project_name @project.name
 json.project_author @project.owner.try(:login)
 json.project_author_name @project.owner.try(:show_real_name)
+json.has_created_pull_requests @project.pull_requests.size > 0
 
 json.issues do
   json.array! @issues.to_a do |issue|