Fix crash when user presses send report before onload handler was called

chrome/browser/dom_ui/bug_report_ui.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/dom_ui/bug_report_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 635 matching lines @@
 
   ListValue screenshots_list;
   for (size_t i = 0; i < saved_screenshots.size(); ++i)
     screenshots_list.Append(new StringValue(saved_screenshots[i]));
   dom_ui_->CallJavascriptFunction(L"setupSavedScreenshots", screenshots_list);
 }
 #endif
 
 
 void BugReportHandler::HandleSendReport(const ListValue* list_value) {
+  if (!bug_report_) {
+    LOG(ERROR) << "Bug report hasn't been intialized yet.";
+    return;
+  }
+
   ListValue::const_iterator i = list_value->begin();
   if (i == list_value->end()) {
     LOG(ERROR) << "Incorrect data passed to sendReport.";
     return;
   }
 
   // #0 - Problem type.
   int problem_type;
   std::string problem_type_str;
   (*i)->GetAsString(&problem_type_str);
@@ skipping 138 matching lines @@
   BugReportUIHTMLSource* html_source =
       new BugReportUIHTMLSource(handler->Init());
   // Set up the chrome://bugreport/ source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
           ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }