human
Solve the following python programming problem given the following code:
@ traced 
def on_tick(self, * args) : 
    @ traced 
    def begin_search() : 
        self.frontend_status = 'searching' 
        q = self._create_query () 
        self._pending_search = self._db.search_async (q) 
        self._last_search_query = q 
@ traced 
    def on_ready() : 
        try : 
            res = self._pending_search.result 
except db_proxy.AsyncSearchError : 
            res = None 
self.frontend_status = None 
        self._pending_search = None 
        trace_begin ('update_results_list') 
        if res : 
            self.update_results_list (res.filenames, res.ranks) 
else : 
            self.update_results_list ([], []) 
trace_end ('update_results_list') 
        self._pending_search = None 
@ traced 
    def update_backend_status() : 
        self.backend_status = self._db.status () 
if self._pending_search : 
        if self._pending_search.ready : 
            on_ready () 
if (not update_backend_status._pending_search) : 
        if self._last_search_query : 
            need_to_begin_search = (self._filter_text != self._last_search_query.text) 
else : 
            need_to_begin_search = True 
if (need_to_begin_search and self._can_process_queries) : 
            begin_search () 
else : 
            update_backend_status () 
if self._pending_search : 
        message_loop.post_delayed_task (self.on_tick, TICK_RATE_WHEN_SEARCHING) 
else : 
        if self._db_is_up_to_date : 
            message_loop.post_delayed_task (self.on_tick, TICK_RATE_WHEN_UP_TO_DATE) 
else : 
            message_loop.post_delayed_task (self.on_tick, TICK_RATE_WHEN_NOT_UP_TO_DATE) 

    
    

    Fix the buggy line: if (not update_backend_status._pending_search) :
assistant
#Here is Python code to fix the buggy line: if (not update_backend_status.

if (not self._pending_search) :