title: Protractor How to click on a blank place
body: <p>We are using Protractor to test an Angular JS project.
  There is one page I need to click on a blank place (any blank place) to trigger the auto save after filled in all the required fields.</p>
  
  <p>But I don't know how. I tried to find a useless image or click back on a text box. It cannot work.</p>
  
  <p>Stacktrace:</p>
  
  <blockquote>
    <p>UnknownError: unknown error: Element is not clickable at point (975, 357). Other element would receive the click: ...*</p>
  </blockquote>
  
  <p>Any comments will be helpful, thanks very much.</p>