get_counts_index is an internal utility function to find out where
the counts are (if anywhere.). Stops if there's no assay called 'counts',
(unless there is only a single unnamed assay).
How many assays are there? ie: length(assays(dataset_se))
What are the assays called? ie: names(assays(dataset_se))
The index of an assay in assays called 'counts', or, if there's just the one unnamed assay - happily assume that that is counts.
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