Update Sizzle: fixes fail in traversing tests

diff --git a/src/sizzle b/src/sizzle
index 2e9e0a25ee04d63dab94ffe25d7adedd8d241f51..fb50e0dbef448934ed1a11f3a46ab262587d36c6 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 2e9e0a25ee04d63dab94ffe25d7adedd8d241f51
+Subproject commit fb50e0dbef448934ed1a11f3a46ab262587d36c6