Subapps don't work in debug mode

[imbolc]

Expected behaviour

It expected to work:

from aiohttp import web

app = web.Application(debug=True)
app.router.add_subapp('/sub', web.Application())
web.run_app(app)

Actual behaviour

I got the exception:

Traceback (most recent call last):
  File "app.py", line 5, in <module>
    web.run_app(app)
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/site-packages/aiohttp/web.py", line 394, in run_app
    loop=loop))
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/asyncio/base_events.py", line 387, in run_until_complete
    return future.result()
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/asyncio/tasks.py", line 239, in _step
    result = coro.send(None)
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/site-packages/aiohttp/web.py", line 330, in startup
    yield from self.on_startup.send(self)
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/site-packages/aiohttp/signals.py", line 47, in send
    yield from self._pre.send(ordinal, self._name, *args, **kwargs)
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/site-packages/aiohttp/signals.py", line 59, in send
    yield from self._send(ordinal, name, *args, **kwargs)
  File "/home/imbolc/.pyenv/versions/3.5.2/lib/python3.5/site-packages/aiohttp/signals.py", line 14, in _send
    res = receiver(*args, **kwargs)
TypeError: handler() takes 1 positional argument but 3 were given

[asvetlov]

Fixed by c7bbcbc

[asvetlov]

Thanks for bug report.

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