title: settings bundle - default value behaviour?
body: <p>I have created a settings bundle with a single preference value, a text field with a default value.</p>
  
  <p>When my application launches and I retrieve the value it is null. Do I have to manually code the value to use before the user has provided a value?</p>
  
  <p>Also if the user does to the preferences screen and enters the text field then leave it without making any changes the value will not be set ... the user has to actually change the value for it to be saved, is this correct?</p>