ARROW-11328: [R] Collecting zero columns from a dataset returns entire dataset
ARROW-11328: [R] Collecting zero columns from a dataset returns entire dataset

Closes #9958 from pachamaltese/arrow11328

Lead-authored-by: Mauricio Vargas <75919093fc69d86e4175e8385616cffbbcd14f7f@dcc.uchile.cl>
Co-authored-by: Pachamaltese <75919093fc69d86e4175e8385616cffbbcd14f7f@dcc.uchile.cl>
Signed-off-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>

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