How do you make SymPy pretty-print Symbol('') without raising TypeError?

verbatim agent-facing issue statement

Exception when printing Symbol('')
```
In [41]: Symbol('')
Out[41]: ---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/Users/aaronmeurer/anaconda3/lib/python3.5/site-packages/IPython/core/formatters.py in __call__(self, obj)
    697                 type_pprinters=self.type_printers,
    698                 deferred_pprinters=self.deferred_printers)
--> 699             printer.pretty(obj)
    700             printer.flush()
    701             return stream.getvalue()

/Users/aaronmeurer/anaconda3/lib/python3.5/site-packages/IPython/lib/pretty.py in pretty(self, obj)
    366                 if cls in self.type_pprinters:
    367                     # printer registered in self.type_pprinters
--> 368                     return self.type_pprinters[cls](obj, self, cycle)
    369                 else:
    370                     # deferred printer

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/interactive/printing.py in _print_plain(arg, p, cycle)
     66         """caller for pretty, for use in IPython 0.11"""
     67         if _can_print_latex(arg):
---> 68             p.text(stringify_func(arg))
     69         else:
     70             p.text(IPython.lib.pretty.pretty(arg))

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/pretty/pretty.py in pretty(expr, **settings)
   2109
   2110     try:
-> 2111         return pp.doprint(expr)
   2112     finally:
   2113         pretty_use_unicode(uflag)

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/pretty/pretty.py in doprint(self, expr)
     58
     59     def doprint(self, expr):
---> 60         return self._print(expr).render(**self._settings)
     61
     62     # empty op so _print(stringPict) returns the same

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/printer.py in _print(self, expr, *args, **kwargs)
    255                 printmethod = '_print_' + cls.__name__
    256                 if hasattr(self, printmethod):
--> 257                     return getattr(self, printmethod)(expr, *args, **kwargs)
    258
    259             # Unknown object, fall back to the emptyPrinter.

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/pretty/pretty.py in _print_Symbol(self, e)
     73
     74     def _print_Symbol(self, e):
---> 75         symb = pretty_symbol(e.name)
     76         return prettyForm(symb)
     77     _print_RandomSymbol = _print_Symbol

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/pretty/pretty_symbology.py in pretty_symbol(symb_name)
    508         return symb_name
    509
--> 510     name, sups, subs = split_super_sub(symb_name)
    511
    512     def translate(s) :

/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/printing/conventions.py in split_super_sub(text)
     55     # make a little exception when a name ends with digits, i.e. treat them
     56     # as a subscript too.
---> 57     m = re.match('(^[a-zA-Z]+)([0-9]+)$', name)
     58     if m is not None:
     59         name, sub = m.groups()

/Users/aaronmeurer/anaconda3/lib/python3.5/re.py in match(pattern, string, flags)
    161     """Try to apply the pattern at the start of the string, returning
    162     a match object, or None if no match was found."""
--> 163     return _compile(pattern, flags).match(string)
    164
    165 def fullmatch(pattern, string, flags=0):

TypeError: expected string or bytes-like object
```

It has something to do with the unicode pretty printer. `pprint(Symbol(''), use_unicode=False)` works.