fix completion for clojure-lsp(check type of results)

autoload/ddc_vim_lsp.vim

@@ -9,7 +9,10 @@ function! ddc_vim_lsp#_callback(server, position, id, data) abort
       \ 'response': a:data['response'],
       \ }
   let lspitems = lsp#omni#get_vim_completion_items(l:options)['items']
-  let isIncomplete = has_key(a:data['response']['result'], 'isIncomplete') ? 
+  let isIncomplete = (
+        \   type(a:data['response']['result']) == 4
+        \   && has_key(a:data['response']['result'], 'isIncomplete')
+        \ ) ?
         \ a:data['response']['result']['isIncomplete'] : v:false
 
   call ddc#callback(a:id, {'items': lspitems, 'isIncomplete': isIncomplete})