Check for space between the filename in a header block and description.

    like such:
    # /path/to/filename
    #
    # Description

def _space_in_headerblock(relative_path, contents, linter_options):
    """Check for space between the filename in a header block and description.

    like such:
    # /path/to/filename
    #
    # Description
    """
    del relative_path
    del linter_options

    check_index = 1

    if len(contents) > 0:
        if _line_is_shebang(contents[0]):
            check_index = 2

    if len(contents) < check_index + 1:
        description = ("""Document cannot have less """
                       """than {0} lines""").format(check_index + 1)
        return LinterFailure(description, 1, replacement=None)

    candidate = contents[check_index]

    if not _match_space_at_line(candidate):
        description = """The second line must be an empty comment"""
        return LinterFailure(description, check_index + 1,
                             _comment_type_from_line(candidate)[:-1] + "\n" +
                             candidate)