Don't show help menu when browser unavailable

- Fix b/10860551

Change-Id: I71d073ef96d406f1705672d7ccf75337e5250ec6

src/com/android/settings/HelpUtils.java

@@ -16,6 +16,7 @@
 
 package com.android.settings;
 
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageInfo;
@@ -95,9 +96,15 @@ public class HelpUtils {
 
             // Set the intent to the help menu item, show the help menu item in the overflow
             // menu, and make it visible.
+            ComponentName component = intent.resolveActivity(context.getPackageManager());
+            if (component != null) {
                 helpMenuItem.setIntent(intent);
                 helpMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
                 helpMenuItem.setVisible(true);
+            } else {
+                helpMenuItem.setVisible(false);
+                return false;
+            }
 
             // return that the help menu item is visible (i.e., true)
             return true;