[tools/rdfconverter] Add finalize call

Call `finalize` for every document to make sure
all `links` and `includes` are resolved before
exporting an odml document to rdf.

Author: mpsonntag

odml/tools/rdf_converter.py

@@ -88,6 +88,8 @@ def convert_to_rdf(self):
         if self.docs:
             for doc in self.docs:
                 if isinstance(doc, BaseDocument):
+                    # make sure links and includes are resolved before conversion
+                    doc.finalize()
                     self.save_element(doc)
 
         return self.graph