[issue45820] Parser can segfault if an error happens before reading any input

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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components: +Parser
nosy: +lys.nikolaou
versions: +Python 3.10, Python 3.11, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45820>
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