Improve syntax error for try block without finally or except block

[pablogsal]

BPO	44305
Nosy	@pablogsal
PRs	#26523 #26524

^{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 = None
closed_at = <Date 2021-06-03.22:53:44.991>
created_at = <Date 2021-06-03.21:48:37.462>
labels = []
title = 'Improve syntax error for try block without finally or except block'
updated_at = <Date 2021-06-03.23:11:51.484>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2021-06-03.23:11:51.484>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2021-06-03.22:53:44.991>
closer = 'pablogsal'
components = []
creation = <Date 2021-06-03.21:48:37.462>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 44305
keywords = ['patch']
message_count = 3.0
messages = ['395053', '395056', '395057']
nosy_count = 1.0
nosy_names = ['pablogsal']
pr_nums = ['26523', '26524']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue44305'
versions = []

[pablogsal]

Given this script:
try:
x = 34

a = 1

instead of printing:
File "/home/pablogsal/github/python/master/lel.py", line 4
a = 1
^
SyntaxError: invalid syntax

we should print:

File "/home/pablogsal/github/python/master/lel.py", line 4
a = 1
^
SyntaxError: expected 'except' or 'finally' block

[pablogsal]

New changeset b250f89 by Pablo Galindo in branch 'main':
bpo-44305: Improve syntax error for try blocks without except or finally (GH-26523)
b250f89

[pablogsal]

New changeset e53f72a by Pablo Galindo in branch '3.10':
[3.10] bpo-44305: Improve syntax error for try blocks without except or finally (GH-26523) (GH-26524)
e53f72a