Sizzle: fixes issue with :empty pseudo and comment nodes

diff --git a/src/sizzle b/src/sizzle
index 14574d0f516f0cc3d2c4c22f9d39d9ea8bf1366e..4fc4b92a1d1037b70162faf19860c2aac2ae5622 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 14574d0f516f0cc3d2c4c22f9d39d9ea8bf1366e
+Subproject commit 4fc4b92a1d1037b70162faf19860c2aac2ae5622