et_fraction from the README example is null

[pblankenau2]

Hi,

If you run the example code the et_fraction is completely masked out. Other images have the same issue.

import openet.ssebop as ssebop

landsat_img = ee.Image('LANDSAT/LC08/C02/T1_L2/LC08_044033_20170716')
et_fraction = ssebop.Image.from_landsat_c2_sr(landsat_img).et_fraction
et_reference = ee.Image('IDAHO_EPSCOR/GRIDMET/20170716').select('etr')
et_actual = et_fraction.multiply(et_reference)

[pblankenau2]

I tried the exact same code again today and it worked. Very strange.