Display message using If condition is null in Power-shell

Hi All,

         I am getting list of particular product using power-shell.I want to display the info if i didn't get any list of info as "No information  exist with this product".

       I had received snippet of code in power-shell to find office product I want to know weather "$Mylist" is null of not .if null  I would like to show message.Can any one help me how can I do this

$Mylist= gwmi Win32_Product |?{$_.Name -match 'office'}|select name

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