Allow null SM.submitter (per schema). There were null values in cn-dev (and probably elsewhere since it is technically allowed in the schema. But with a null value, we need to have a null Subject for the SM.submitter field, not a Subject with a null getValue() return. Encountered this when testing for: https://projects.ecoinformatics.org/ecoinfo/issues/5929.
Allow null SM.submitter (per schema). There were null values in cn-dev (and probably elsewhere since it is technically allowed in the schema. But with a null value, we need to have a null Subject for the SM.submitter field, not a Subject with a null getValue() return. Encountered this when testing for: https://projects.ecoinformatics.org/ecoinfo/issues/5929.