Warn users if they attempt a FuncADL_Uproot submission with no tree defined

ssl-hep / ServiceX_frontend

Client access library for ServiceX

https://servicex-frontend.readthedocs.io/

BSD 3-Clause "New" or "Revised" License

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Warn users if they attempt a FuncADL_Uproot submission with no tree defined #452

Closed ponyisi closed 1 week ago

ponyisi commented 2 months ago

Users need to give a .FromTree selection when using FuncADL_Uproot. Error if this is missing so they don't have to puzzle through some bizarre error message on the transformer side.