Found a function that does exactly the same changing it.

> I implemented the isBoundExternalVariable adding a new function in
> context/dynamic_context called is_set_variable which returns true if it is set
> or false if it doesn't I could have use the get_variable but I would have to
> catch the error it throws when is not set.
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https://code.launchpad.net/~zorba-coders/zorba/xqxq-api-changes/+merge/79589
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