optional concatenate

I need to concatenate 2 different sets of CSV. Sometimes a group of them is missing, so I need only one of them. How can I do it without errors?
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Hello @andreahfp,

this is an older thread where we discussed it but should still (hopefully) be applicable:

Br,
Ivan

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Hello @andreahfp ,

You can us Try Catch nodes. Reference below examples

Just give a placeholder/ dummy file as second input to Concatenate node in case of errors.
Thanks

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@andreahfp could be something like this:

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