Stop showing broken image icon on the new post page

views/new-post.php

@@ -133,12 +133,15 @@
 
 <script>
 function previewPhoto(event) {
-  document.getElementById('photo_preview').src = URL.createObjectURL(event.target.files[0]);
+  $("#photo_preview")
+    .show()
+    .attr("src", URL.createObjectURL(event.target.files[0]) );
 }
 
 $(function(){
 
   var userHasSetCategory = false;
+  $("#photo_preview").hide();
 
   $("#note_content").on('change keyup', function(e){
     var text = $("#note_content").val();