Only name output bands if it won't error

[mikemahoney218]

This isn't a complete PR, because this needs testing and I'm not sure if this should trigger a warning. But this change means that get_stac_data() can download data that's stored as a multi-band file without erroring on this step. Maybe the actual fix is in get_stac_data() and we don't pass band_names here?

For instance, this change lets you download NAIP:

rsi::get_stac_data(
  aoi,
  start_date = "2019-01-01",
  end_date = "2022-12-31",
  output_filename = "dubuar_naip.tif",
  asset_names = c("image"),
  stac_source = "https://planetarycomputer.microsoft.com/api/stac/v1",
  collection = "naip",
  sign_function = rsi::sign_planetary_computer,
  pixel_x_size = 1,
  pixel_y_size = 1
)

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