Fixed a runtime exception when running via source
Fixed a runtime exception when running via source

When running via source (I did not attempt to build the project),
it exited with the following exception:

	Traceback (most recent call last):
		File ".\item_tracker.py", line 229, in main
			rt.run()
		File ".\item_tracker.py", line 80, in run
			event_result = drawing_tool.handle_events()
		File ".\view_controls\view.py", line 116, in handle_events
			self.__reflow()
		File ".\view_controls\view.py", line 272, in __reflow
			items_to_flow = [x for x in self.state.item_list if self.show_item(x)]
	AttributeError: 'NoneType' object has no attribute 'item_list'

The simple fix in this commit made everything run correctly.

Environment details:
Windows 10
Python 2.7.11 (Anaconda 4.0.0 64-bit))
Pygame 1.9.2a0 (from https://conda.binstar.org/krisvanneste/win-64/pygame-1.9.2a0-py27_0.tar.bz2)

Hyphen-ated/RebirthItemTrackerTest,Zamiell/RebirthItemTracker,sillypears/RebirthItemTracker,Hyphen-ated/RebirthItemTracker,viroulep/RebirthItemTracker,viroulep/RebirthItemTracker