[pgsql-www] Empty ul on navmenu

When the navmenu is empty in base/page.html, the sidebar renders an empty list
 which is illegal HTML.  One example (the only?) is on account/login/.
Fix by checking length of passed list as in attached.

This removes the one gray line in the sidebar which could be seen as perhaps
making the page look a bit (more) lopsided, but thats a separate issue.
Personally I don’t think an empty gray box looks better, but if we want that it
could be fixed with 
 that renders and shows the gray background.

cheers ./daniel


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