Avoid the term 'no value' as distinct from 'the empty sequence' #646
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This is my attempt to fix #642
I've taken the option I described in the issue and made the global context item dependent on whether or not the value is the empty sequence, not whether or not its present. I made similar changes elsewhere to avoid the term "no value" when "empty sequence" is meant.
If we adopt this PR, the test
ab-xslt-094will also need to be changed.