[Console][PhpUnitBridge][VarDumper] Fix NO_COLOR empty value handling

Author: alexandre-daubois

DeprecationErrorHandler.php

@@ -410,7 +410,7 @@ private static function hasColorSupport()
         }
 
         // Follow https://no-color.org/
-        if (isset($_SERVER['NO_COLOR']) || false !== getenv('NO_COLOR')) {
+        if ('' !== ($_SERVER['NO_COLOR'] ?? getenv('NO_COLOR') ?: '')) {
             return false;
         }
 

bin/simple-phpunit.php

@@ -368,7 +368,7 @@ class_exists(\SymfonyExcludeListSimplePhpunit::class, false) && PHPUnit\Util\Bla
     }
 }
 
-$cmd[0] = sprintf('%s %s --colors=%s', $PHP, escapeshellarg("$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit"), false === $getEnvVar('NO_COLOR') ? 'always' : 'never');
+$cmd[0] = sprintf('%s %s --colors=%s', $PHP, escapeshellarg("$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit"), '' === $getEnvVar('NO_COLOR', '') ? 'always' : 'never');
 $cmd = str_replace('%', '%%', implode(' ', $cmd)).' %1$s';
 
 if ('\\' === \DIRECTORY_SEPARATOR) {
@@ -458,7 +458,7 @@ class SymfonyExcludeListSimplePhpunit
         {
         }
     }
-    array_splice($argv, 1, 0, ['--colors='.(false === $getEnvVar('NO_COLOR') ? 'always' : 'never')]);
+    array_splice($argv, 1, 0, ['--colors='.('' === $getEnvVar('NO_COLOR', '') ? 'always' : 'never')]);
     $_SERVER['argv'] = $argv;
     $_SERVER['argc'] = ++$argc;
     include "$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit";