MS Forms with branching. Getting responses from the form and creating list items in SPO. Date field branching issue!!

[Dltran7]

The branching part is the issue. When it doesn't need to branch out, the date field is set via initializing and setting the variable. This works great but when branches out and leaves the date/time column blank, I get this error: 

Unable to process template language expressions in action 'Set_DateDeath_variable' inputs at line '0' and column '0': 'In function 'formatDateTime', the value provided for date time string '' was not valid. The datetime string must match ISO 8601 format.'.

I have a condition setup like this: 

If date field is equal to null

If Yes, it will use this expression from a Compose data operator with expression below:

if(empty(outputs('Compose')),null,outputs('Compose'))

If No, it doesn't branch out and displays the date field. 

I am stuck here. Any help is greatly appreciated. Thank you!!