pyramid_reproject doesn't put NaNs

[ahuang11]

import xarray as xr
import rioxarray
from ndpyramid import pyramid_coarsen, pyramid_reproject

# load a sample xarray.Dataset
ds = xr.tutorial.load_dataset('air_temperature')

# make a coarsened pyramid
factors = [8, 4, 2, 1]
pyramid = pyramid_coarsen(ds, factors=factors, dims=['lat', 'lon'], boundary='trim')

# make a reprojected (EPSG:3857) pyramid
ds = ds.rio.write_crs('EPSG:4326')
pyramid = pyramid_reproject(ds, levels=len(factors))

# write the pyramid to zarr
# pyramid.to_zarr('test.zarr')

pyramid["0"].isel(time=0).ds["air"].plot()

Expected to see something like

import xarray as xr
import rioxarray
from ndpyramid import pyramid_coarsen, pyramid_reproject

# load a sample xarray.Dataset
ds = xr.tutorial.load_dataset('air_temperature')

# make a coarsened pyramid
factors = [8, 4, 2, 1]
pyramid = pyramid_coarsen(ds, factors=factors, dims=['lat', 'lon'], boundary='trim')

# make a reprojected (EPSG:3857) pyramid
ds = ds.rio.write_crs('EPSG:4326')
pyramid = pyramid_reproject(ds, levels=len(factors))

[maxrjones]

Thanks for the bug report @ahuang11! This was fixed in #110. We'll cut a release in the next week or so.