Code with invalid quotes get successfully converted

[gousaiyang]

Describe the bug
Code with invalid quotes get successfully converted.

To Reproduce

>>> import f2format
>>> s = 'hello'
>>> code = "f'{s + ''}'"
>>> print(f2format.convert(code))
'{}'.format(s + '')
>>> eval(code)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
SyntaxError: f-string: expecting '}'
>>>

Expected behavior
f2format.convert() should raise an error to report that the code is invalid

[gousaiyang]

Seems like still a bug of parso:

>>> import parso
>>> s = 'hello'
>>> code = "f'{s + ''}'"
>>> parso.parse(code, error_recovery=False)
<Module: @1-1>

[gousaiyang]

Fixed in parso 0.5.2.