[Expression] Do not transform NULL integer as 0 when concat #36521
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Description
Fixes #36112
Providers returns QVariant ( QVariant::Int ) for null integer, which converts to "0" as a string. This PR proposes to not concat null values.
The issue doesn't occured for OGR data (GPKG for instance) because this provider returns a null QString for any null values while others provider don't (spatialite, postgres, delimitedtext)