Recover after a failed varlistitem parse.

Maybe would be better to just bail out after a parse error.

[SVN r64975]

tools/quickbook

@@ -1 +1 @@
-Subproject commit 4b41d22c87b8a23f9a89d29be60bc4814863439f
+Subproject commit 19ad99139a852d46b6c7cf9b87720d485dbcd365