Add a default picture, so that we don't force people to find one.

Implementation is ugly but the cleanest I could come with :(

shell/intro/intro.py

@@ -63,6 +63,7 @@ class IntroFallbackVideo(gtk.EventBox):
         self._image = gtk.Image()
         self._image.set_from_stock(gtk.STOCK_OPEN, -1)
         self.add(self._image)
+        self._image.show()
         self.connect('button-press-event', self._button_press_event_cb)
 
     def play(self):
@@ -80,12 +81,15 @@ class IntroFallbackVideo(gtk.EventBox):
         resp = chooser.run()
         if resp == gtk.RESPONSE_ACCEPT:
             fname = chooser.get_filename()
-            pixbuf = gtk.gdk.pixbuf_new_from_file(fname)
-            self.emit('pixbuf', pixbuf)
+            self.load_image(fname)
         chooser.hide()
         chooser.destroy()
         return True
 
+    def load_image(self, path):
+        pixbuf = gtk.gdk.pixbuf_new_from_file(path)
+        self.emit('pixbuf', pixbuf)
+
 class VideoBox(hippo.CanvasBox, hippo.CanvasItem):
     __gtype_name__ = "SugarVideoBox"
 
@@ -138,6 +142,10 @@ class VideoBox(hippo.CanvasBox, hippo.CanvasItem):
         self._img_widget = hippo.CanvasWidget()
         self._img_widget.props.widget = self._img
 
+        if not has_webcam:
+            path = os.path.join(env.get_data_dir(),'default-picture.png')
+            self._video.load_image(path)
+
     def _clear_image_cb(self, widget, event):
         del self._pixbuf
         self._pixbuf = None