* glib/dbus-gproxy.c: Put in a pile of assertions that the proxy name
	is not NULL when it shouldn't be. Also a couple of possible fixes
	for #4637 though I don't understand why the bug happens, to be
	honest... also the object constructor has an assert name != NULL
	and the name is only currently NULL for peer-to-peer proxies that
	I don't think anyone uses? So it should be asserting.
	Anyway, for now at least see if we get an earlier assertion failure.

	* glib/dbus-gvalue-utils.c: Put in a couple of assertions for
	apparently broken code to be sure the tests fail and someone
	will fix them...