René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"\"Show source\" on empty line throws exception","articleBody":"```\nbpython version 0.16 on top of Python 2.7.12+ /tmp/_env/bin/python2\n\u003e\u003e\u003e \nTraceback (most recent call last):\n  File \"/tmp/_env/bin/bpython\", line 11, in \u003cmodule\u003e\n    sys.exit(main())\n  File \"/tmp/_env/local/lib/python2.7/site-packages/bpython/curtsies.py\", line 190, in main\n    exit_value = repl.mainloop()\n  File \"/tmp/_env/local/lib/python2.7/site-packages/bpython/curtsies.py\", line 125, in mainloop\n    self.process_event_and_paint(e)\n  File \"/tmp/_env/local/lib/python2.7/site-packages/bpython/curtsies.py\", line 99, in process_event_and_paint\n    array, cursor_pos = self.paint()\n  File \"/tmp/_env/local/lib/python2.7/site-packages/bpython/curtsiesfrontend/repl.py\", line 1468, in paint\n    1, width, self.status_bar.current_line, self.config)\n  File \"/tmp/_env/local/lib/python2.7/site-packages/bpython/curtsiesfrontend/replpainter.py\", line 227, in paint_statusbar\n    return fsarray([func(msg.ljust(columns))[:columns]])\n  File \"/tmp/_env/local/lib/python2.7/site-packages/curtsies/formatstring.py\", line 628, in fmtstr\n    string = FmtStr.from_str(string)\n  File \"/tmp/_env/local/lib/python2.7/site-packages/curtsies/formatstring.py\", line 180, in from_str\n    return FmtStr(Chunk(s))\n  File \"/tmp/_env/local/lib/python2.7/site-packages/curtsies/formatstring.py\", line 70, in __init__\n    raise ValueError(\"unicode string required, got %r\" % string)\nValueError: unicode string required, got 'Nothing to get source of\n                                          '\n```\n\nSeems like a Python 2 issue only, not reproducible under Python 3.\n","author":{"url":"https://github.com/Trundle","@type":"Person","name":"Trundle"},"datePublished":"2016-10-10T21:29:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/642/bpython/issues/642"}