I'm using Umbraco 7

I was trying to only show the item.content and item.file only if it has value. But if user didn't upload/input any text it shouldn't be showing.

I've tried using this code but it still shows the content and download button despite the item has no file/content to show

<!-- Check first if content or file exists -->
@if(item.content!=null){
    <a href="#@item.Id" data-toggle="collapse">Lihat selengkapnya &raquo;</a>
    <div id="@item.Id" class="collapse">
    <p>@item.content</p>
<!-- Check if file exists -->   
    @if(item.file!=null){
       <p>
          <a href="@item.file" class="btn btn-warning">Download</a>
       </p>
    }
}

Is there any other way to check if a property is exist but has no value/empty?

Thanks!