Default /tag/-base URL bad for seo? 'Cause the base-only page doens't exist.

Hi!

If I use any tag URL format with a base, let’s say the standard one with /tag/ as the base, will this be bad voor SEO? I always thought when you use a base, it can’t be an not-existing page, for SEO purposes.

So for example; the link will be: http://www.mysite.com/tag/tag-name,
but http://www.mysite.com/tag/ will not exist.

What are your thoughts about this? Create a http://www.mysite.com/tag/ page, or is this not necessary? I preferably don’t want to delete the /tag/-base from the URL.

Thanks guys!