title: Gson deserialize with null int can't seems to work
body: <p>When i download data on the web, sometimes it works and sometime it doesn't.
  And my problem is in one <code>int</code> : 
  runtime: ""</p>
  
  <p>runtime is an int and when i use gson on it can cause this problem :</p>
  
  <pre><code>01-07 21:22:57.602: E/AndroidRuntime(2726): Caused by: java.lang.NumberFormatException: Invalid int: ""
  </code></pre>
  
  <p>and i tried to some if statement but it doesn't work.</p>
  
  <pre><code>public int getRuntime() {
      if(Integer.valueOf(runtime)==null){
          return 0;
      }else{
          return runtime;
      }
  }
  </code></pre>
  
  <p>or even</p>
  
  <pre><code>public int getRuntime() {
      if(Integer.valueOf(runtime).equals(null)){
          return 0;
      }else{
          return runtime;
      }
  }
  </code></pre>
  
  <p>but nothing works.</p>