Fail to assign a variable declared in zscript to a custom attribute in the page scope

Steps to reproduce

1. load the attached zul

actual result

value3 is nothing printed.

Debug information

• value3 is 1 if you run the same zul with ZK 7.0.6

Workaround

• Use http://books.zkoss.org/wiki/ZK_Developer's_Reference/UI_Patterns/Page_Initialization instead

impact

• This issue will cause unexpected functional failures for users' project.