Trim empty lines. Nothing but newline.

git-svn-id: https://develop.svn.wordpress.org/trunk@5700 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-smtp.php

@@ -28,13 +28,13 @@ class SMTP
      *  @var int
      */
     var $SMTP_PORT = 25;
-    
+
     /**
      *  SMTP reply line ending
      *  @var string
      */
     var $CRLF = "\r\n";
-    
+
     /**
      *  Sets whether debugging is turned on
      *  @var bool
@@ -508,7 +508,7 @@ class SMTP
         }
 
         $this->helo_rply = $rply;
-        
+
         return true;
     }