redirect to plugin list broken

[nwittstruck]

I saw that there were some changes to the UrlMapping recently, so this may be work in progress, but currently the redirect to the plugin list action are broken and are redirecting to /plugins/tag instead. That causes a 404, since there is no tag set.
I encountered this issue when omitting the query parameter in the plugin search field.
/plugins/search?q= redirects to /plugins/tag and not /plugins/list.