Fix loading Flux Dev transformers from_single_file #10541
                
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Description and reproducer in:
#10540
Please check the added condition before you merge.
This code works, but I am not sure what the key in question does. It seems to be absent in transformer-only Flux.Dev files. But it could also be absent in transformer-only Flux Fill files? I don't know. In that case, a different condition to tell the two apart is needed.
Fixes #10540 (issue)
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@DN6