fix(chinaz): accept empty arrays, check ValueType over truthiness

Addresses CodeRabbit review: jsoniter's ToBool returns false for empty arrays as well as missing keys, so a valid response with ContributingSubdomainList: [] would incorrectly trip the shape-mismatch branch. Switch to ValueType() != ArrayValue; the iteration loop handles empty arrays naturally (0 results, no error emitted).

pkg/subscraping/sources/chinaz/chinaz.go

@@ -58,7 +58,7 @@ func (s *Source) Run(ctx context.Context, domain string, session *subscraping.Se
 		}
 
 		SubdomainList := jsoniter.Get(body, "Result").Get("ContributingSubdomainList")
-		if !SubdomainList.ToBool() {
+		if SubdomainList.ValueType() != jsoniter.ArrayValue {
 			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: fmt.Errorf("chinaz: unexpected response shape, missing Result.ContributingSubdomainList")}
 			s.errors++
 			return