51423: AtomParser: fixes PHP 8 fatal error in wp-includes/atomlib.php#718

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hellofromtonya wants to merge 3 commits intoWordPress:masterfrom

hellofromtonya:fix/51423-wp-includes-atomlib.php

Commits on Nov 9, 2020

wp-includes/atomlib.php: Check the `fopen` failure condition.
hellofromtonya
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Commits on Nov 10, 2020

Directly checks if fopen fails, ie false is returned on failure.
hellofromtonya
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Commits on Nov 22, 2020

Skips while and fclose to ensure rest of code runs.
hellofromtonya
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