Requirement: how to create a Power Automate if the body is empty
Create a Manually trigger a flow. Next take an compose action as an empty array. Add another action initialize variable
Name: Body is empty
Type: Boolean
Value: true

Now click on the Next step and select condition control, then provide the below information:
value : true
operator: is equal to
value: empty(outputs('Compose'))
If the above condition is true, then click on add an action and select set variable action and select a variable name, and set the value as true.
And if the above condition is false, then click on add an action and select set variable action and select the variable name, and set the value as false.

Now click on save, and run the flow manually. And the block is empty so it returns true.
