used start_with, next if empty field

lib/tasks/web_crawler.rake

@@ -27,6 +27,7 @@ namespace :crawler do
         job_page = Nokogiri::HTML(HTTParty.get(url).body)
         # Job
         job_title = job_page.css('div.job-desc h1.title').text
+        next if job_title.nil?
         # update_at, job_industries, job_type, salary, experience, level, expiration_date
         detail_box_items = job_page.css('.job-detail-content .detail-box ul li')
         # init
@@ -121,7 +122,7 @@ namespace :crawler do
     list_location.each do |city|
       city_name = city.text
       region = :international
-      if city_name.include?('Việc làm tại')
+      if city_name.start_with?('Việc làm tại')
         city_name = city_name.remove('Việc làm tại').strip
         region = :vietnam
       end