Fix parsing empty strings

Julien LepillerThu Apr 02 15:27:51+0200 2020

696a4c5

guile-rdf/turtle
namelast commitdate
parser.scmFix local escape parsingThu Apr 02 04:28:13+0200 2020
tordf.scmFix parsing empty stringsThu Apr 02 15:27:51+0200 2020