Bug in dc.load(): Error not raised when using resampling with a dictionary containing incorrect band names.

[GL-S]

Expected behaviour

When using "resampling" in dc.load() with a dictionary containing the methods for different bands, an error should be raised if a non-existent band name is entered.

Actual behaviour

An error is not raised if a non-existing band name is entered. Maybe the non-existing band is just ignored.
This could create issues when writing typos without realising it.

Steps to reproduce the behaviour

import datacube
dc = datacube.Datacube(app="04_Loading_data")
ds_customresampling = dc.load(product="ga_ls8cls9c_gm_cyear_3",
                              x=(153.3, 153.4),
                              y=(-27.5, -27.6),
                              time=("2015-01-01", "2015-12-31"),
                              output_crs="EPSG:32756",
                              resolution=(-250, 250),
                              resampling={"band_with_typo": "nearest", "*": "average"})
ds_customresampling

Environment information

datacube version 1.8.19

bug noticed when running the Beginners_guide notebook 04_Loading_data.ipynb