[Bug 29263] if expression: optional else branch?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=29263

--- Comment #7 from Michael Kay <mike@saxonica.com> ---
Why did we decide that an InitialClause in a FLWOR expression should be
mandatory? 

Without that rule, we could write

where $var/foo return $var/foo/data()

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