Merger sites - bad files list

I have been debugging a problem with (temporary) lost merger site permission (see closed issue Question: Not a merger site! #944). I can see that the error occurs (lost merger permission) for fileGet request to a file on bad files list. Adding a list of bad files in my code solved the problem.

Any way to get a list of bad files in ZeroFrame API for merger sites so I can avoid downloading files on bad list? Or alternative a better fileGet error handling in ZeroFrame API. Empty fileGet response for bad files would be OK for me.