Issue #3357657: ComposerValidator catches an exception and assumes it is because the path to Composer is not set

package_manager/src/Validator/ComposerValidator.php

@@ -54,9 +54,6 @@ class ComposerValidator implements EventSubscriberInterface {
       $this->composerInspector->validate($dir);
     }
     catch (\Throwable $e) {
-      // @todo There are other reasons this exception could have happened
-      //   besides Composer not being found. Explain those reasons in our online
-      //   help, and update this link, in https://drupal.org/i/3357657.
       if ($this->moduleHandler->moduleExists('help')) {
         $message = $this->t('@message See <a href=":package-manager-help">the help page</a> for information on how to resolve the problem.', [
           '@message' => $e->getMessage(),