Fix TypeError when a JSON file can not be read

[villfa]

Hi,

I got the following error with Composer 2.3.5 but it affects also the 2.2 branch.

It happened after running composer install, but unfortunately I didn't manage to reproduce the problem afterwards.

Fatal error: Uncaught TypeError: Composer\Json\JsonFile::parseJson(): Argument #1 ($json) must be of type ?string, bool given, called in phar:///usr/local/bin/composer/src/Composer/Json/JsonFile.php on line 117 and defined in phar:///usr/local/bin/composer/src/Composer/Json/JsonFile.php:311
Stack trace:
#0 phar:///usr/local/bin/composer/src/Composer/Json/JsonFile.php(117): Composer\Json\JsonFile::parseJson(false, '/var/www/vendor...')
#1 phar:///usr/local/bin/composer/src/Composer/Repository/FilesystemRepository.php(82): Composer\Json\JsonFile->read()
#2 phar:///usr/local/bin/composer/src/Composer/Repository/ArrayRepository.php(311): Composer\Repository\FilesystemRepository->initialize()
#3 phar:///usr/local/bin/composer/src/Composer/Factory.php(590): Composer\Repository\ArrayRepository->getPackages()
#4 phar:///usr/local/bin/composer/src/Composer/Factory.php(435): Composer\Factory->purgePackages(Object(Composer\Repository\InstalledFilesystemRepository), Object(Composer\Installer\InstallationManager))
#5 phar:///usr/local/bin/composer/src/Composer/Factory.php(614): Composer\Factory->createComposer(Object(Composer\IO\ConsoleIO), Array, true, '/var/www', true, false)
#6 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(469): Composer\Factory::create(Object(Composer\IO\ConsoleIO), NULL, true, false)
#7 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(411): Composer\Console\Application->getComposer(false, true)
#8 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(352): Composer\Console\Application->hintCommonErrors(Object(ErrorException), Object(Symfony\Component\Console\Output\ConsoleOutput))
#9 phar:///usr/local/bin/composer/vendor/symfony/console/Application.php(171): Composer\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#10 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(130): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#11 phar:///usr/local/bin/composer/bin/composer(88): Composer\Console\Application->run()
#12 /usr/local/bin/composer(29): require('phar:///usr/loc...')
#13 {main}
  thrown in phar:///usr/local/bin/composer/src/Composer/Json/JsonFile.php on line 311

PHP version: 8.0.17

[Seldaek]

Weird that it would fail without throwing above, really wonder how that happened, but I guess this strictly doesn't hurt so thanks