fixed get_colid to give back an NA when not found for uri attribute #367
fixed get_eolid to give back an NA when not found for uri attribute #367
fixed get_tpsid to give back an NA when not found for uri attribute #367
fixed get_nbnid to give back an NA when not found for uri attribute #367
fixed get_* boldid gbifid tpsid and ubioid to give back an NA when not found for uri attribute closes #367