Error saving Dataflow - One or more tables references a dynamic datasource

[mroberts_troy]

So I've seen lots of threads about this, but my case is different (I think).  I have built a standard dataflow that will be deployed to every project workspace.  Unfortunately, not every project has one of the key datasources, so I have built in a final step in each query that simply says "try #"The Last Step" otherwise #table({}, {})".  This is my way of preventing failures in case that "required" datasource isn't available.

That's the only thing I've changed on this dataflow template.

But now I can't get the edited dataflow to save - it says "One or more tables references a dynamic datasource".  

Does anyone have any recommendations?

[mroberts_troy]

Due to needing this done ASAP, I decided to create a template without any references to the missing file.  If someone could still make a recommendation so we can consolidate these templates, that would be super.