BipartiteGraph() fails to create graph from graph6 string #33366
Description
Calling BipartiteGraph('Bo', format='graph6') produces meaningless error:
ValueError: if input format is graph6, then g6_string must be a string.
Component: graph theory
Author: Enjeck Cleopatra
Branch/Commit: 6d70523
Reviewer: David Coudert
Issue created by migration from https://trac.sagemath.org/ticket/33366