bindings/python: implement Threads().__nonzero__

 __nonzero__ checks if Threads() contains at least one more valid thread

 The existence of this function makes 'if Threads(): foo' work, as that
 previously implicitely called len() exhausting the iterator. This
 function makes `bool(Threads())` work repeatedly.

For further info, see http://docs.python.org/reference/datamodel.html.
Credits for the hint go to Brian May.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

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