Checking something isEmpty in Javascript?
<p>How can I check if a variable is empty in Javascript? Sorry for the stupid question, but I'm a newbie in Javascript!</p>

<pre><code>if(response.photo) is empty {
    do something
else {
    do something else
}
</code></pre>

<p><code>response.photo</code> was from JSON, and it could be empty sometimes, empty data cells! I want to check if it's empty.</p>
