Zarr_file_example is broken

[tylere]

Tile bounds should be extracted from the first record (code):
minx, miny, maxx, maxy = bbox.bounds.iloc[0]

Tile errors (error code 422) are occurring:

[isaacbrodsky]

I think this is rather that the tiles that are erroring are all NaN, if you check for that you can return before

    if np.all(np.isnan(data_array)):
        # This tile is entirely NaN, so render as all zeroes
        print("All NaN")
        return None

    # Compute min and max values, excluding NaN
    valid_min = math.floor(np.nanmin(data_array))
    valid_max = math.ceil(np.nanmax(data_array))

    # Masking the NaN values and replcing with values outside min max
    masked_data = np.nan_to_num(data_array, nan=valid_min - 1)

    # Using the minmax for color mapping
    arr = utils.arr_to_plasma(masked_data, min_max=(valid_min, valid_max))
    return arr