Fix errors handling in the parser module

BPO	30070
Nosy	@rhettinger, @benjaminp, @serhiy-storchaka
PRs	bpo-30070: Fixed leaks and crashes in errors handling in the parser module. #1131 [3.6] bpo-30070: Fixed leaks and crashes in errors handling in the pa… #1184 [3.5] bpo-30070: Fixed leaks and crashes in errors handling in the pa… #1185 [2.7] bpo-30070: Fixed leaks and crashes in errors handling in … #1189

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2017-04-19.21:50:22.323>
created_at = <Date 2017-04-14.11:07:11.622>
labels = ['extension-modules', '3.7', 'type-crash']
title = 'Fix errors handling in the parser module'
updated_at = <Date 2017-04-19.21:50:22.323>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-04-19.21:50:22.323>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2017-04-19.21:50:22.323>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2017-04-14.11:07:11.622>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 30070
keywords = []
message_count = 6.0
messages = ['291645', '291855', '291890', '291899', '291903', '291910']
nosy_count = 3.0
nosy_names = ['rhettinger', 'benjamin.peterson', 'serhiy.storchaka']
pr_nums = ['1131', '1184', '1185', '1189']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue30070'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7']