Fix mapping validation

Julien LepillerSun Apr 12 23:40:51+0200 2020

382d5dc

Fix mapping validation

rdf/rdf.scm

543543 
                      (assoc-ref (rdf-dataset-named-graphs d2)
544544 
                                 (assoc-ref mapping name))
545545 
                      (assoc-ref (rdf-dataset-named-graphs d2) name))))
546-
      (validate-mapping mapping graph graph2)))
546+
      (and graph2 (validate-mapping mapping graph graph2))))
547547 
548548 
  (and (validate-mapping mapping (rdf-dataset-default-graph d1)
549549 
                         (rdf-dataset-default-graph d2))