title: Checking if viewWithTag exists before removingFromSuperview
body: <p>Is it safe to use <code>[[self.view viewWithTag:999] removeFromSuperview];</code> without checking if the view actually exists?</p>
  
  <p>There is no error on simulator but will it cause no problem on a real device?</p>
  
  <p>Is there any drawback of not using such condition?</p>