checkCondition should handle []interface{} for intersect operations

[moorereason]

The following new test cases fail in TestCheckCondition:

{reflect.ValueOf([]interface{}{"a"}), reflect.ValueOf([]string{"a", "b"}), "intersect", expect{true, false}},
{reflect.ValueOf([]string{"a"}), reflect.ValueOf([]interface{}{"a", "b"}), "intersect", expect{true, false}},

The issue is that checkCondition only sets slv and slmv (L106) if v and mv are of the same type (L85); therefore, the eventual call to ns.Intersect (L205) is made with two nil params.

See discussion thread for use case and rationale: https://discourse.gohugo.io/t/7435

Test site from @budparr: https://github.com/budparr/Test-Case-for-defining-relationships-across-sections/blob/master/layouts/index.html

[github-actions]

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