fix(model): invalid incremental output

Author: kevinlin09

src/main/java/com/alibaba/dashscope/aigc/generation/GenerationParam.java

@@ -94,7 +94,7 @@ public static class ResultFormat {
    * apple
    * </pre>
    */
-  @Builder.Default private Boolean incrementalOutput = false;
+  @Builder.Default private Boolean incrementalOutput;
 
   /** Maximum tokens to generate. */
   private Integer maxTokens;
@@ -192,11 +192,14 @@ public Map<String, Object> getParameters() {
       params.put("temperature", temperature);
     }
     // Apply different logic based on model version
-    if (ParamUtils.isQwenVersionThreeOrHigher(getModel())) {
+     if (ParamUtils.isQwenVersionThreeOrHigher(getModel())) {
       if (incrementalOutput != null) {
         params.put("incremental_output", incrementalOutput);
       }
     } else {
+      if (incrementalOutput == null) {
+        incrementalOutput = false;
+      }
       if (incrementalOutput) {
         params.put("incremental_output", incrementalOutput);
       }

src/main/java/com/alibaba/dashscope/aigc/multimodalconversation/MultiModalConversationParam.java

@@ -98,7 +98,7 @@ public class MultiModalConversationParam extends HalfDuplexServiceParam {
    * apple
    * </pre>
    */
-  @Builder.Default private Boolean incrementalOutput = false;
+  @Builder.Default private Boolean incrementalOutput;
 
   /** Output format of the model including "text" and "audio". Default value: ["text"] */
   private List<String> modalities;
@@ -232,6 +232,9 @@ public Map<String, Object> getParameters() {
         params.put(ApiKeywords.INCREMENTAL_OUTPUT, incrementalOutput);
       }
     } else {
+      if (incrementalOutput == null) {
+        incrementalOutput = false;
+      }
       if (incrementalOutput) {
         params.put(ApiKeywords.INCREMENTAL_OUTPUT, incrementalOutput);
       }