cd and ls crash when passed a non-directory link

Commencez dans Cmdline.java aux points d’entrée de cd et ls identifiés par les stack traces, puis reproduisez les deux appels depuis Interpreter avec un lien ou un fichier qui n’est pas un répertoire. Suivez la validation de chaque chemin et confirmez le traitement prévu des liens qui ne sont pas des répertoires ; le travail est terminé lorsque aucune des deux commandes ne plante et que les cas signalés se comportent de manière cohérente.

    Uh oh! You've found an error in Core.
    This happened while running your code, so you may be able to find a workaround, but is ultimately an issue in Core.
    The following code caused the error:
    ls('file.zip')
    on or around Interpreter:1.
    Please report this to the developers, and be sure to include the version numbers:
    Server version: SHELL;
    MethodScript version: 3.3.4;
    Loaded extensions and versions:
    Core (3.3.4)
    Here's the stacktrace:
    java.lang.NullPointerException
            at com.laytonsmith.core.functions.Cmdline$ls.exec(Cmdline.java:1699)
            at com.laytonsmith.core.Script.eval(Script.java:409)
            at com.laytonsmith.core.MethodScriptCompiler.execute(MethodScriptCompiler.java:2818)
            at com.laytonsmith.tools.Interpreter$4.run(Interpreter.java:832)
            at java.lang.Thread.run(Thread.java:748)
    
    Uh oh! You've found an error in Core.
    This happened while running your code, so you may be able to find a workaround, but is ultimately an issue in Core.
    The following code caused the error:
    cd('file.zip')
    on or around Interpreter:1.
    Please report this to the developers, and be sure to include the version numbers:
    Server version: SHELL;
    MethodScript version: 3.3.4;
    Loaded extensions and versions:
    Core (3.3.4)
    Here's the stacktrace:
    java.lang.IllegalArgumentException: File provided to SetRootFolder must be a folder, not a file. (.\Downloads\2656-netstat-ipv6.PID.zip was found.)
            at com.laytonsmith.core.environments.GlobalEnv.SetRootFolder(GlobalEnv.java:209)
            at com.laytonsmith.core.functions.Cmdline$cd.exec(Cmdline.java:1648)
            at com.laytonsmith.core.Script.eval(Script.java:409)
            at com.laytonsmith.core.MethodScriptCompiler.execute(MethodScriptCompiler.java:2818)
            at com.laytonsmith.tools.Interpreter$4.run(Interpreter.java:832)
            at java.lang.Thread.run(Thread.java:748)