code: @Nullable
    public static byte [] getAllFileBytes (@Nullable final File aFile)
    {
      return aFile == null ? null : StreamHelper.getAllBytes (FileHelper.getInputStream (aFile));
    }
docs: Get the content of the file as a byte array.
  
  @param aFile
  The file to read. May be <code>null</code>.
  @return <code>null</code> if the passed file is <code>null</code> or if the
  passed file does not exist.