fixing loading up so that the error message for invalid/missing file …

…stays hidden upon startup of page

src/templates/index.ejs

@@ -6,7 +6,7 @@
 
             <div class="container">
 
-                <div id="warn-missing-file" class="alert alert-warning" hidden="true">
+                <div id="warn-missing-file" class="alert alert-warning" hidden>
                     <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
                     <strong>Warning!</strong> The file inputed was not found (Error 404).
                 </div>