So, the title might be very confusing. I will try to explain best. I have a collection where users are adding batches. The interface looks something like this:

In the Sharepoint list, I have 10 columns each of the 3 variables: Batch, Packaging, and unique ID. The user can input upto 10 batches but often it is much less. I want to supply empty strings to remaining columns if user doesn't add all 10 batches
This is what my add batch looks like:
Collect(
BatchMVC,
{
CBatchNumber: BatchNumberInput.Text,
CPackaging: PackagingDropdown.Selected.Value,
CUniqueID: UniqueIDInput.Text
}
);
Set(ID,ID+1);
Set(BatchNos,Concat(BatchMVC,CBatchNumber & ","));
Set(Packaging,Concat(BatchMVC,CPackaging & ","));
Set(UniqueID,Concat(BatchMVC,CUniqueID & ","));

This is what my sharepoint list looks like, for U also similarly there are 10 columns
Please help in how I can assign empty strings to column in case user doesn't add 10 batches