Flow failing due to null/empty values from multiselects in MS Forms

[milanb]

Hi. Happy New Year.

I am having an issue with a flow that is failing whilst trying to get multiselect data that also contains null values (multi selects) from an MS Form into a Sharepoint list in an array.

Background

I have created a resource request form using MS Forms. You can request up to 3 resources in the one form. For each resource that is being requested, there is a multiselect to capture vetting requirements.

‘Vetting Array post 1’ one is fairly straghtforward – I just convert the string into an array.

However, ‘Compose Vetting post 2’  (and ‘Compose Vetting post 3’) are more complicated (for me anyway!) as either of these could contain null/empty values.

What I would like is to have a flow that would process the multi select data into Sharepoint in an array where data exists and ignore the multiselects that have null values.

I have already referenced the article https://powerusers.microsoft.com/t5/Building-Flows/Filter-null-values-from-a-Forms-Array/td-p/254699...

and used the comments provided by @AlanPs1 

I modified the 'if' statement to create the following for ‘Compose Vetting post 2’:

If there is only one resource, the workflow completes successfully (including create item)

However, when I add an additional resource (‘Compose Vetting Post 2’), the output is still in a ‘String’ format:

As a result, ‘create item’ also fails.

How am I able to convert this output into an array?

Any help would be greatly appreciated.