small but crucial bug fix in computation of reliability_index by getMostRecentClassification: if ref_has_opinion is NULL and the opinion is unrated it should always have a rating of 2 (previously, it inherited the reference's rating)
small but crucial bug fix in computation of reliability_index by getMostRecentClassification: if ref_has_opinion is NULL and the opinion is unrated it should always have a rating of 2 (previously, it inherited the reference's rating)

paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new