Flow How to test if MultiChoice is empty array?

Usually this should be empty, null or empty string. But after my migration


 1. find the value, with loops it can be something like "items('Apply_to_each_2')?['Value']"

2. init variable and set it as Expression "string(items('Apply_to_each_2')?['Value'])"

3. test is vs "string('[]')"

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