Remove accidental NQuadsParser

Author: mielvds

lib/pyld/canon.py

@@ -45,7 +45,6 @@ def main(self, dataset: str | dict | Dataset, options) -> str | dict:
             ):
                 raise UnknownFormatError('Unknown input format.', options['format'])
             rdflib.NORMALIZE_LITERALS = False
-            parser = NQuadsParser()
             parser.parse(StringInputSource(dataset), rdflib_dataset)
         elif isinstance(dataset, dict):
             rdflib_dataset = from_legacy_dataset(dataset)