Fix error reporting for the runner if body isn't defined

hmdne · hmdne · commit cd54f3e1b9a1 · 2021-11-17T12:51:25.000+01:00
diff --git a/index.html.erb b/index.html.erb
@@ -2,7 +2,8 @@
 <html>
 <head>
   <title>Opal Browser - RSpec Runner</title>
-
+</head>
+<body>
   <script>
     window.onerror = function(msg, url, line) {
       var error = document.createElement("div");
@@ -18,8 +19,6 @@
   <script src="spec/wgxpath.install.js"></script>
 
   <%= javascript_include_tag @server.main %>
-</head>
-<body>
 </body>
 </html>
 
