Microsoft power automate update null value in lookup

I was working on a power automate where I needed to check if a value is null or not then update look up values. One option was to check in every if/else statement but thats too messy and lengthy.

You can check this one line of code in your look up

if(empty(variables('Resolution')), ' ',concat(variables('Resolution')))

In above example, first I stored my look up value in a variable to make it simple, you can use your attribute here directly if you need to.

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