set_state() could be called when there are still no formats.

shell/view/clipboardicon.py

@@ -91,7 +91,10 @@ class ClipboardIcon(CanvasIcon):
     def set_state(self, name, percent, icon_name, preview, activity):
         cb_service = clipboardservice.get_instance()
         obj = cb_service.get_object(self._object_id)
-        installable = (obj['FORMATS'][0] == 'application/vnd.olpc-x-sugar')
+        if obj['FORMATS'] and obj['FORMATS'][0] == 'application/vnd.olpc-x-sugar':
+            installable = True
+        else:
+            installable = False
 
         self._name = name
         self._percent = percent

shell/view/frame/clipboardpanelwindow.py

@@ -46,11 +46,11 @@ class ClipboardPanelWindow(FrameWindow):
         self.connect("drag_data_get", self._clipboard_box.drag_data_get_cb)
 
     def _owner_change_cb(self, clipboard, event):
+        logging.debug("owner_change_cb")
+
         if self._clipboard_box.owns_clipboard():
             return
 
-        logging.debug("owner_change_cb")
-
         cb_service = clipboardservice.get_instance()
         key = cb_service.add_object(name="")
         cb_service.set_object_percent(key, percent = 100)