Conditional != or !== statements in Liquid

Hi there,

I’m trying to use a conditional statement that checks for 

• navigator.useragent
• sessionStorage.get(‘some item’)
• localStorage.get(‘some item’)

E.g. {% if localStorage.get('some-item') != undefined  %}

<div>Some div</div>

{% else %}

<div>Some other div</div>

{% endif %}  

When I preview the page, this doesn’t seem to do what I intend. E.g. if there is no localStorage with that key, it still shows “Some div”