Don't die if file tags.lst doesn't exist.

die() cuts the document at the position of the error. We just return an
empty datalist.

index.php

@@ -292,7 +292,8 @@
 
     <datalist id="list_tags">
       <?php
-      $file = fopen("tags.lst", "r") or die("Unable to open autocompletion file.");
+      if ($file = fopen("tags.lst", "r"))
+      {
           while(!feof($file))
           {
               $tag = rtrim(fgets($file));
@@ -302,6 +303,7 @@
               }
           }
           fclose($file);
+      }
       ?>
     </datalist>
   </body>