Filter sheet list by presence of title block or not

As I’m fairly new to Dynamo i have run into a problem I can’t seem to solve. I have created a graph to automate the creation of sheet sets in our company
Problem I run in to is we have some standard sheets in our template with no titleblock present.

So i need to filter these out, in the attached image you can see I have more sheets in list then titleblocks. Any way I can filter these sheets to a list with only sheets containing titleblocks on them?

Thanks in advance

Assuming Sheet.Titleblock still returns an empty list (or null) for the sheets without TBs, just count the number of TBs per sheet and filter those with 0.

Thanks for you quick response

It seems like your approach solved my problem

Thanks alot