Options to (de)select page in lookup search results made available co…

[jlipka]

…nditionally

References

• Fixes #3312

Description

Emit a result list even if no items are found (result list of 0 items). The "Select page" and "Deselect page" drop-down options in the search results list are disabled if there are zero items in the result list

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I would be pleased if someone could check whether my changes are appropriate and whether these changes could cause problems elsewhere.

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