title: How to get the URL "about:blank" from empty tab using selenium?
body: <p>I need to check that an opened tab is empty and switch to another one.</p>
  
  <p>I tried the <code>get_current_url()</code> method, but it does not work.</p>
  
  <pre><code>def check_is_tab_empty(self, link):
      self.click(link)
      self.focus_active_tab()
      tab = self.get_current_url()
  </code></pre>
  
  <p>This line <code>tab = self.get_current_url()</code> - does not work if a tab is empty, like <code>about:blank</code>.</p>