Fixed user feedback crash on parameter check (std exception was thrown)....

chrome/browser/dom_ui/bug_report_ui.cc

 // Copyright (c) 2009 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 "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/callback.h"
 #include "base/file_util.h"
@@ skipping 436 matching lines @@
 }
 
 base::StringPiece BugReportHandler::Init() {
   std::string page_url;
   if (tab_->controller().GetActiveEntry()) {
      page_url = tab_->controller().GetActiveEntry()->url().spec();
   }
 
   std::string params = page_url.substr(strlen(chrome::kChromeUIBugReportURL));
   // Erase the # - the first character.
-  params.erase(params.begin(),params.begin() + 1);
+  if (params.length())
+    params.erase(params.begin(),params.begin() + 1);
 
   int index = 0;
   if (!base::StringToInt(params, &index)) {
     return base::StringPiece(
         ResourceBundle::GetSharedInstance().GetRawDataResource(
             IDR_BUGREPORT_HTML_INVALID));
   }
 
   Browser* browser = BrowserList::GetLastActive();
   // Sanity checks.
@@ skipping 220 matching lines @@
   BugReportUIHTMLSource* html_source =
       new BugReportUIHTMLSource(handler->Init());
   // Set up the chrome://bugreport/ source.
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(
           Singleton<ChromeURLDataManager>::get(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }