checking variable is null in laravel blade file

I have the variable $material_details->pricing=null I want to check the variable is set in laravel blade file.I have tried as

@isset($material_details->pricing)
 <tr>
   <td>price is not null</td>
 </tr>
@endisset

but no luck .How to check the variable is set or not in laravel 5.3 blade file.

via Chebli Mohamed