Remove first line from Textarea

I have a tool that removes the blank lines from a confirmation (text) but for some reason there is a top line that is not being read as blank line and does not get deleted.

Currently my tool allows a person to paste text into the textarea then when "remove spaces & copy" button is clicked blank lines are removed and text is copied to the clipboard.

I want to keep the same function but somehow delete the first line either when text is entered into the textarea or when "remove spaces & copy" button is clicked.

 <script>
 function copyToClipboard(element) {
  var text = $(element).clone().find('br').prepend('\r\n').end().text()
  element = $('<textarea>').appendTo('body').val(text).select()
  document.execCommand('copy')
  element.remove()
  }
  </script>

<textarea name="mas" rows="100" rows="50" contenteditable="true" id="p20" class="content" onchange="this.value=this.value.replace(/[\n\r](?!\w)/gi,'');" style="height: 500px; width:800px;" type="text" data-bind="value: myValue, hasFocus: cleared"></textarea>

<!----------- BUTTONS ------------>
<div class="fixed">
<button onclick="copyToClipboard('#p20')" class="templateBtn">Remove Spaces & Copy</button>
<input type="button" data-bind="click: clearValue" value="clear" class="templateBtn" />
<script type="text/javascript">
    var viewModel = {
   myValue: ko.observable(''),
   cleared: ko.observable(false),
   clearValue: function() {       
   this.myValue('');   
   this.cleared(true);
    }
  };

  ko.applyBindings(viewModel);
   </script>

  <!----------- END.BUTTONS ------------>

 <div class="mas" id="hide" ></div>

 <pre contenteditable="true" id="p20" class="templateText">

 </div></div>