[Laurettta]

declare context item now raises XPTY0004 if the value is empty or has more than one item. Added a test for it.

Closes #4946

[codacy-production]

Not up to standards ⛔

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}