fix(topdata): reject null condition groups

internal/topdata/json_contract.go

@@ -97,10 +97,7 @@ func parseGlobalConditionGroups(injection map[string]any) (globalConditionGroups
 
 func parseGlobalConditionList(name string, raw any, requireNonEmpty bool) ([]globalCondition, error) {
 	if raw == nil {
-		if requireNonEmpty {
-			return nil, fmt.Errorf("%s must be an array", name)
-		}
-		return nil, nil
+		return nil, fmt.Errorf("%s must be an array", name)
 	}
 
 	conditions, ok := raw.([]any)