gui: do 60114447 properly

artiq/gui/state.py

@@ -70,14 +70,15 @@ class StateManager(TaskObject):
         pyon.store_file(self.filename, data)
 
     async def _do(self):
+        try:
             try:
                 while True:
                     await asyncio.sleep(self.autosave_period)
                     self.save()
+            finally:
+                self.save()
         except asyncio.CancelledError:
             pass
         except:
             logger.error("Uncaught exception attempting to save state",
                          exc_info=True)
-        finally:
-            self.save()