在python的vim中未检测到选项卡/空格错误

Question

以下代码用于检测给出头节点的两个链表的合并点：-

def findMergeNode(head1, head2):

    def get_count(head):

        current = head

        while(current):

            count = count + 1
            current = current.next

        return count

    #Assuming Linked List-1 is lengthier than Linked List-2

    def get_intersection_node(d,head1,head2):

        current_1 = head1
        current_2 = head2

        for i in range(d):
            current_1 = current_1.next

        while(current_1 and current_2):

            if(current_1 == current_2):
                return current_1.data

            current_1 = current_1.next
            current_2 = current_1.next

    count_1 = get_count(head1)

    count_2 = get_count(head2)

    d = abs(count_1 - count_2)

    if(count_1 > count_2):

        return get_intersection_node(d,head1,head2)

    else:

        return get_intersection_node(d,head2,head1)

    return 0

尽管此代码在算法和语法上均正确无误，但在hackerrank上提交时却出现了缩进错误。我已经使用vim和python -tt命令检查了它，但是没有看到任何制表符/空格错误。 有人可以指出此代码或hackerrank论坛的python提交文件存在任何潜在/未发现的问题吗？

确切错误：-

Sorry: IndentationError: expected an indented block (solution.py, line 123)

我的代码甚至连100行都没有。由于某种原因，它正在Hackerrank提供的代码中显示错误。