title: cJSON field does not exist
body: <p>I have a JSON array as follows. I am using cJSON to parse it. However, I want to check if a field exists in my array. I have tried to use cJSON_GetObjectItem and cJSON_IsNull and compare its return value to NULL to determine if a field does not exist. </p>
  
  <p>But, that does not seem to work. Is there some other way to find out if a field is present or not (ex: age is not present in the second subarray)?</p>
  
  <pre><code>  "people":
     [
      {
          "name": "Mickey",
          "age": 7
      },
  
      {
         "name": "Susan"
  
      }
  ]
  </code></pre>