refactor(接口测试): 接口定义导入 har 文件报错修复

--bug=1009828 --user=周骏弘 【接口测试】github#9732，导入har包报错 https://www.tapd.cn/55049933/s/1099430

backend/src/main/java/io/metersphere/api/dto/definition/parse/HarParser.java

@@ -243,8 +243,10 @@ public class HarParser extends HarAbstractParser {
             return;
         }
         String contentType = content.mimeType;
-        body.setType(getBodyType(contentType));
-        body.setRaw(content.text);
+        if(body != null){
+            body.setType(getBodyType(contentType));
+            body.setRaw(content.text);
+        }
     }
 
     private String parseXmlBody(String xmlString) {

backend/src/main/java/io/metersphere/api/dto/scenario/Body.java

@@ -37,10 +37,13 @@ public class Body {
 
     public boolean isValid() {
         if (this.isKV()) {
-            return kvs.stream().anyMatch(KeyValue::isValid);
+            if(kvs != null){
+                return kvs.stream().anyMatch(KeyValue::isValid);
+            }
         } else {
             return StringUtils.isNotBlank(raw);
         }
+        return false;
     }
 
     public boolean isKV() {