Fix: Bug: VimwikiGoto without argument creates empty page (issue #1229)

autoload/vimwiki/base.vim

@@ -492,7 +492,7 @@ endfunction
 function! vimwiki#base#goto(...) abort
   " Jump: to other wikifile, specified on command mode
   " Called: by command VimwikiGoto (Exported)
-  let key = a:0 > 0 ? a:1 : input('Enter name: ', '',
+  let key = a:0 > 0 && a:1 !=# '' ? a:1 : input('Enter name: ', '',
         \ 'customlist,vimwiki#base#complete_links_escaped')
 
   let anchor = a:0 > 1 ? a:2 : ''

doc/vimwiki.txt

@@ -4019,12 +4019,15 @@ master is retained as a legacy mirror of the dev branch.
 
 This is somewhat experimental, and will probably be refined over time.
 
-Fixed:~
+New:~
     * Issue #1261: Feature: Support for <mark> in Markdown
       highlighting with yellow background and back foreground
     * Issue #1274: Feature: Continue blockquote when <CR>
       is pressed in insert mode
       Also add the |blockquote_markers| variable
+
+Fixed:~
+    * Issue #1229: Bug: VimwikiGoto without argument creates empty page
     * Issue #1316: Permit tags in heading
     * Issue #1270: VimwikiAddHeaderLevel map (3=) was broken by a previous
       refactoring commit