PHP8: Avoids a warning about the undefined variable in the case file_get_contents fails #822
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[Full Changelog](4.62.0...4.62.1) **Merged Pull Requests** - Correct implicit null parameter types which are deprecated in PHP 8.4 [#832](#832) ([signe](https://github.com/signe)) - PHP8: Avoids a warning about the undefined variable in the case file_get_contents fails [#822](#822) ([Chikashi-Kato](https://github.com/Chikashi-Kato))
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E_WARNING: Undefined variable $http_response_headeris reported whenfile_get_contentsfails to fetch the specified$url. This seems to happen because HTTP Wrapper doesn't set$http_response_headerwhen it fails.Since PHP 8 accesses to undefined variables are reported as E_WARNING, this became more visible and noisier.
This PR avoids the warning by using a coalescing operator.