force quit hangs terminal

[magicbane]

Reproduce:

1. devassistant-gui in terminal
2. android-studio -> create dummy project -> check sdk-> next
3. prompts download android-studio -> check yes.
4. click X to quit
5. terminal hangs despite ctrl-c or ctrl-d

---

devassistant-gui    master 
/usr/lib/python3.4/site-packages/devassistant/gui/init.py:19: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
from gi.repository import Gtk
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
^CException ignored in: <module 'threading' from '/usr/lib64/python3.4/threading.py'>
Traceback (most recent call last):
File "/usr/lib64/python3.4/threading.py", line 1294, in _shutdown
t.join()
File "/usr/lib64/python3.4/threading.py", line 1060, in join
self._wait_for_tstate_lock()
File "/usr/lib64/python3.4/threading.py", line 1076, in _wait_for_tstate_lock
elif lock.acquire(block, timeout):
File "/usr/lib/python3.4/site-packages/devassistant/sigint_handler.py", line 14, in signal_handler
logger.info('DevAssistant received SIGINT, exiting ...')
File "/usr/lib64/python3.4/logging/init.py", line 1274, in info
self._log(INFO, msg, args, **kwargs)
File "/usr/lib64/python3.4/logging/init.py", line 1409, in _log
self.handle(record)
File "/usr/lib64/python3.4/logging/init.py", line 1419, in handle
self.callHandlers(record)
File "/usr/lib64/python3.4/logging/init.py", line 1481, in callHandlers
hdlr.handle(record)
File "/usr/lib64/python3.4/logging/init.py", line 853, in handle
self.emit(record)
File "/usr/lib/python3.4/site-packages/devassistant/gui/run_window.py", line 89, in emit
list_store.append([format_entry(record, colorize=True)])
AttributeError: 'NoneType' object has no attribute 'append'
^C^C