Handle exception in jsonld signature check

pyjsonld.py

@@ -2378,8 +2378,13 @@ class JsonLdProcessor(object):
                 # hash bnode paths
                 path_namer = UniqueNamer('_:b')
                 path_namer.get_name(bnode)
-                results.append(self._hash_paths(
-                    bnode, bnodes, namer, path_namer))
+                try:
+                    bnode_path = self._hash_paths(
+                        bnode, bnodes, namer, path_namer)
+                    results.append(bnode_path)
+                except BaseException:
+                    print('WARN: jsonld bnode_path failed')
+                    pass
 
             # name bnodes in hash order
             cmp_hashes = cmp_to_key(lambda x, y: cmp(x['hash'], y['hash']))