Fix: Link containing only '-'

Issue #835 #876

autoload/vimwiki/base.vim

@@ -2123,6 +2123,10 @@ function! s:clean_url(url) abort
   let url = substitute(url, '^//', '', '')
   let url = substitute(url, '^\([^/]\+\)\.\a\{2,4}/', '\1/', '')
   let url_l = split(url, '/\|=\|-\|&\|?\|\.')
+  " case only a '-'
+  if url_l == []
+    let url_l = [url]
+  endif
   let url_l = filter(url_l, 'v:val !=# ""')
   if url_l[0] ==# 'www'
     let url_l = url_l[1:]

doc/vimwiki.txt

@@ -3621,6 +3621,8 @@ Fixed:~
     * Issue #404: Don't conceal strikethrough character in tables.
     * Issue #318: Markdown syntax bold, italic, and italic/bold are now
       rendered correctly.
+    * Issue #835: Pressing enter on the dash of a markdown list causes an error.
+    * Issue #876: E684: list index out of range: 0, when creating a link containing a `.`.
 
 
 2.4 (2019-03-24)~