fix: uproot.dask: Protect against branches=None
in project_columns
#806
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In
uproot.dask
'sproject_columns
implementations we need to make surebranches
is notNone
before looping over the argument. (The optimization indask-awkward
will run project_columns withNone
branches if the the optimization determines that all original branches are necessary). more info at dask-contrib/dask-awkward#134 and dask-contrib/dask-awkward#131