Fix issue http://dartbug.com/2342 by checking document.readyState

frog/minfrog

Index: frog/minfrog
===================================================================
--- frog/minfrog	(revision 5976)
+++ frog/minfrog	(working copy)
@@ -1610,7 +1610,7 @@
   return this._length == (0);
 }
 StringBufferImpl.prototype.add = function(obj) {
-  var str = obj.toString$0();
+  var str = obj.toString();
   if (null == str || str.isEmpty()) return this;
   this._buffer.add(str);
   this._length = this._length + str.length;
@@ -3400,7 +3400,8 @@
   if (this._mixins != null) this.writer.write(this._mixins.get$text());
   this.writeDynamicDispatchMetadata();
   this.writeGlobals();
-  this.writer.writeln("if (typeof window != 'undefined' && window.addEventListener) {");
+  this.writer.writeln("if (typeof window != 'undefined' && typeof document != 'undefined' &&");
+  this.writer.writeln("    window.addEventListener && document.readyState == 'loading') {");
   this.writer.writeln("  window.addEventListener('DOMContentLoaded', function(e) {");
   this.writer.writeln(("    " + mainCall.get$code() + ";"));
   this.writer.writeln("  });");
@@ -15114,7 +15115,8 @@
 var const$0013 = new JSSyntaxRegExp("^[a-zA-Z][a-zA-Z_$0-9]*$");
 var $globals = {};
 $static_init();
-if (typeof window != 'undefined' && window.addEventListener) {
+if (typeof window != 'undefined' && typeof document != 'undefined' &&
+    window.addEventListener && document.readyState == 'loading') {
   window.addEventListener('DOMContentLoaded', function(e) {
     main();
   });