FIXED: Possible crash if rdf_reachable(+,+,-) reaches a literal.  Riste Gligor.
FIXED: Possible crash if rdf_reachable(+,+,-) reaches a literal.  Riste Gligor.

jn7163/swipl-devel,edechter/swipl-devel,edechter/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,mndrix/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,koryonik/swipl-devel,koryonik/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel