New (3.5) subdirectory multisite installs create 'path' without the required leading slash

[markjaquith]

New (that is, not converted to multisite in 3.4.x or earlier) multisite installs in subdirectory mode will create new signups and blogs with a path that looks like this: "sitename/" instead of "/sitename/", and thus they don't work.

Issue has to do with the dropping of $base from wp-config.php, but it still being used in one location.

See #19796 for the work that dropped $base.

[nacin]

I am also debating 22787.diff​, for plugins. But no one has complained, so inclined to ignore it.

[markjaquith]

The other half

[markjaquith]

I tried my patch, and then a compat $base fix (by itself, in a similar location). Both fixed the issue.

[nacin]

In 23107:

Use $current_site->path instead of $base in wpmu_validate_blog_signup(), as $base is now dead. props MarkJaquith. fixes #22787. see #19796.