Error while opening another app from my app

I'm trying to open another app from my app . if that app is not installed my code will open the market place. i use this code

PackageManager pm = getPackageManager();
try
{               
 Intent intent = pm.getLaunchIntentForPackage(package_name);
 startActivity(intent);
}    
catch(android.content.ActivityNotFoundException anfe)
{
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + package_name)));
}

                    

if market is not presence in the device i should open http://play.google.com/store/apps/details?id=<package_name> this url.

how to catch the exception at second time? i have already used catch in my code; can i use one more?

try{
Intent intent = pm.getLaunchIntentForPackage(package_name);
startActivity(intent);
}
catch(Exception anfe)
{
        try{
             startActivity(new Intent(Intent.ACTION_VIEW,    Uri.parse("market://details?id=" + package_name)));
         }
        catch(Exception a){
        {
          startActivity(new Intent(Intent.ACTION_VIEW,    
          Uri.parse("https://play.google.com/store/apps/details?id=" + package_name)));
        }
    }