#6 File chooser "cancel"

[Alexandre TISSERANT]

When you open, save (or save as) a file, a JFileChooser
is opened. But the sofaa user can chose to click
the "cancel" button if this file chooser, or chose to close
this JFileChooser window by clicking on the small right-
up cross button (like in all windows). But this event is
NOT treated for the moment => should test if path
returned from fileChooser is null or not and act in
accordance with this result.