I'm trying a migration (from 7.0.7 to 8.0.0) for an active deployed project and I found a problem on binding expressions.
Let look at this one:

@load(vm.viewMetadata.paziLres.disabled)

All versions before 8.0.0 worked fine even if "paziLres" was null.
But in 8.0.0 a NPE error is raised for that...
I have hundreds of zul with bindings... and could be a BIG problem to test all of them to check those kind of null condition...

I hope you could adjust it quickly in a patch to maintain backward compatibility... otherwise I could not be able to migrate to 8.0.0...