fix(接口测试): 修复mock请求体可以设置jmeter内置函数的问题

--bug=1010903 --user=宋天阳 【接口测试】github#11208，设置了Mock后 字段 为什么是null值

backend/src/main/java/io/metersphere/api/mock/utils/MockApiUtils.java

@@ -709,11 +709,13 @@ public class MockApiUtils {
     }
 
     public static boolean checkParamsCompliance(JSONArray jsonArray, List<MockConfigRequestParams> mockConfigRequestParamList, boolean isAllMatch) {
-        for (int i = 0; i < jsonArray.size(); i++) {
-            JSONObject obj = jsonArray.getJSONObject(i);
-            boolean isMatch = checkParamsCompliance(obj, mockConfigRequestParamList, isAllMatch);
-            if (isMatch) {
-                return true;
+        if (jsonArray != null) {
+            for (int i = 0; i < jsonArray.size(); i++) {
+                JSONObject obj = jsonArray.getJSONObject(i);
+                boolean isMatch = checkParamsCompliance(obj, mockConfigRequestParamList, isAllMatch);
+                if (isMatch) {
+                    return true;
+                }
             }
         }
         return false;