Mulitome: unsupported organism_ontology_term_id returns an ambiguous KeyError rather than a validation error message

[brianraymor]

Context

Reported by @brian-mott on sci-data-eng:

Non-human or non-mouse organism terms fail in this function validate_fragment_stop_coordinate_within_chromosome but not due to a check for correct organism term but because a KeyError is raised when trying to determine the correct organism chromosome length table through the dictionary organism_ontology_term_id_by_chromosome_length_table