code: @Nullable
    public static String getToString (@Nullable final Object aObject, @Nullable final String sNullValue)
    {
      return aObject == null ? sNullValue : aObject.toString ();
    }
docs: Convert the passed object to a string using the {@link Object#toString()}
  method or otherwise return the passed default value.
  
  @param aObject
  The value to be converted. May be <code>null</code>.
  @param sNullValue
  The value to be returned in case the passed object is
  <code>null</code>. May be <code>null</code> itself.
  @return The passed default value in case the passed object was
  <code>null</code> or the result of {@link Object#toString()} on the
  passed object.
  @see Object#toString()