Variable queries return all objects instead of zero results when the referenced object-select property is empty.

When a variable query uses a dynamic object-select property as a filter value, the query correctly returns matching objects while that property is populated. However, when the referenced property is empty, the query returns all objects of the queried type instead of zero results, effectively bypassing the relational filter. This creates misleading results in templates and dashboards by displaying unrelated objects as though they satisfy the query conditions. The expected behavior is for an empty dynamic property to produce zero matches, not an unrestricted result set.