A spacetime application without declarations crashes

[arthur00]

We should either inform that every spacetime applications needs to declare something, or fix this error. I think simulations should be allowed to use spacetime without declaring anything..

Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "C:\Users\Arthur Valadares\Documents\My Dropbox\workspace\spacetime\python\spacetime_local\frame.py", line 250, in __run
    success = self.__register_app(self.__app)
  File "C:\Users\Arthur Valadares\Documents\My Dropbox\workspace\spacetime\python\spacetime_local\frame.py", line 104, in __register_app
    for address, tpmap in self.__app.__declaration_map__.items():
AttributeError: 'NoneType' object has no attribute 'items'