Merge pull request #1227 from OCR-D/fix-ocrd-file-remove-url

OcrdFile: fix removing url

src/ocrd_models/ocrd_file.py

@@ -184,7 +184,7 @@ def url(self, url : Optional[str]) -> None:
         """
         el_FLocat = self._el.find('mets:FLocat[@LOCTYPE="URL"]', NS)
         if url is None:
-            if el_FLocat:
+            if el_FLocat is not None:
                 self._el.remove(el_FLocat)
             return
         if el_FLocat is None: