# Buggy code
def _post_init(self):
    if GUIUtility.getInstance().utility.abcquitting:
        return

    some_ready = any([i.ready for i in self.boosting_manager.boosting_sources.values()])

    # if none are ready, keep waiting or If no source available
    if not some_ready and len(self.boosting_manager.boosting_sources.values()):
        self.guiutility.utility.session.lm.threadpool.add_task(
            self._post_init, 2, task_name=str(self) + "_post_init"
        )
        return

    for _, source_obj in self.boosting_manager.boosting_sources.items():
        self.sourcelist.create_source_item(source_obj)

    self.sourcelist.Show()
    self.main_splitter.ReplaceWindow(self.loading_holder, self.sourcelist)
    self.loading_holder.Close()

    self.Bind(ULC.EVT_LIST_ITEM_SELECTED, self.on_sourceitem_selected, self.sourcelist)

    self.guiutility.utility.session.lm.threadpool.add_task(
        self.sourcelist.load_more, 2, task_name=str(self) + "load_more"
    )
    self.Layout()


# Traceback (isError)
Regression

Tribler.Test.Core.Modules.RestApi.test_downloads_endpoint.TestDownloadsEndpoint.test_remove_download_no_remove_data_param (from nosetests)
Failing for the past 1 build (Since Failed#2109 )
Took 4.4 sec.
Error Message

Test raised 1 unhandled Twisted exceptions:
[{'log_namespace': u'log_legacy', 'log_time': 1467938979.639, 'format': '%(log_legacy)s', 'log_system': '-', 'log_legacy': <twisted.logger._stdlib.StringifiableFromEvent object at 0x06D22830>, 'log_level': <LogLevel=critical>, 'system': '-', 'isError': 1, 'failure': <twisted.python.failure.Failure exceptions.AttributeError: 'NoneType' object has no attribute 'add_task'>, 'time': 1467938979.639, 'log_text': 'Unhandled Error\nTraceback (most recent call last):\n  File "C:\\Python27\\lib\\threading.py", line 763, in run\n    self.__target(*self.__args, **self.__kwargs)\n  File "C:\\workspace\\jenkins\\workspace\\GH_Tribler_PR_tests_win32\\tribler\\Tribler\\Core\\Utilities\\twisted_thread.py", line 55, in _reactor_runner\n    reactor.run(installSignalHandlers=False)\n  File "C:\\Python27\\lib\\site-packages\\twisted\\internet\\base.py", line 1194, in run\n    self.mainLoop()\n  File "C:\\Python27\\lib\\site-packages\\twisted\\internet\\base.py", line 1203, in mainLoop\n    self.runUntilCurrent()\n--- <exception caught here> ---\n  File "C:\\Python27\\lib\\site-packages\\twisted\\internet\\base.py", line 825, in runUntilCurrent\n    call.func(*call.args, **call.kw)\n  File "C:\\workspace\\jenkins\\workspace\\GH_Tribler_PR_tests_win32\\tribler\\Tribler\\Core\\Libtorrent\\__init__.py", line 27, in <lambda>\n    lambda_f = lambda a = args, kwa = kwargs: invoke_func(*a, **kwa)\n  File "C:\\workspace\\jenkins\\workspace\\GH_Tribler_PR_tests_win32\\tribler\\Tribler\\Core\\Libtorrent\\__init__.py", line 28, in invoke_func\n    download.session.lm.threadpool.add_task(lambda_f, 1)\nexceptions.AttributeError: \'NoneType\' object has no attribute \'add_task\'\n', 'log_format': u'{log_text}', 'message': (), 'why': None}]

# Fixed code
def _post_init(self):
    if GUIUtility.getInstance().utility.abcquitting:
        return

    some_ready = any([i.ready for i in self.boosting_manager.boosting_sources.values()])

    # if none are ready, keep waiting or If no source available
    if not some_ready and len(self.boosting_manager.boosting_sources.values()):
        self.register_task(
            str(self) + "_post_init", reactor.callLater(2, self._post_init)
        )
        return

    for _, source_obj in self.boosting_manager.boosting_sources.items():
        self.sourcelist.create_source_item(source_obj)

    self.sourcelist.Show()
    self.main_splitter.ReplaceWindow(self.loading_holder, self.sourcelist)
    self.loading_holder.Close()

    self.Bind(ULC.EVT_LIST_ITEM_SELECTED, self.on_sourceitem_selected, self.sourcelist)

    self.register_task(
        str(self) + "_load_more", reactor.callLater(2, self.sourcelist.load_more)
    )
    self.Layout()