C++ std::unique_ptr return from function and test for null

I have a function that needs to return a pointer to an object of class myClass. For this purpose I´m using std::unique_ptr.

If the function succeeds, it shall return a pointer to a object with data. If it fails, it should return null.

This is my code skelepton:

std::unique_ptr<myClass> getData()
{
   if (dataExists)
      ... create a new myClass object, populate and return it ...

   // No data found
   return std::unique_ptr<myClass> (null); <--- Possible ?
}

on main:

main()
{
   std::unique_ptr<myClass> returnedData;

   returnedData = getData();

   if (returnedData != null)   <-- How to test for null ?
   {
      cout << "No data returned." << endl;
      return 0;
   }

   // Process data
}

So here goes my questions:

a) Is that (returning an object or null) possible to be done using std::unique_ptr ?

b) If possible, how to implement is ?

c) If not possible, what are there alternatives ?

Thanks for helping.