Catch invalid XML in links

lib/importer.py

@@ -133,7 +133,11 @@ class Importer:
             rev = OBSRevision(self.obs, self, project, package).parse(r)
             if not latest or rev.rev > latest.rev:
                 dbrev = DBRevision.import_obs_rev(db, rev)
-                root = rev.read_link()
+                try:
+                    root = rev.read_link()
+                except ET.ParseError:
+                    dbrev.set_broken(db)
+                    continue
                 if root is not None:
                     tprj = root.get("project") or project
                     tpkg = root.get("package") or package