Created attachment 76474 [details] [review]
patch

This trivial patch fixes it for me.

James: Thanks for the patch, do you think you can write a simple test case to demonstrate the bug too?

Here's a standalone unittest:

import unittest

import gobject, sys

class C (gobject.GObject):
	__gsignals__ = { 'my-boxed-signal': (gobject.SIGNAL_RUN_LAST, 
		gobject.type_from_name('GStrv'), ()) }

class TestPyGValue(unittest.TestCase):
	def testNoneNULLBoxedConversion(self):
		obj = C ()
		obj.connect ('my-boxed-signal', lambda obj: None)
		sys.last_type = None
		obj.emit ('my-boxed-signal')
		assert not sys.last_type

if __name__ == '__main__':
	unittest.main()

Sorry about the futzing with sys.last_type - not sure how best to get at an exception in a PyGClosure.

James, Ed: Thanks for the patch/test.

This got committed to svn trunk as revision 657.

Update patch status.