[FIX] web: select completion no result

When a search is performed and the completion feature is used (search on
a many2one field), clicking on a '(no result)' item causes a crash.

opw-703557

addons/web/static/src/js/views/search_view.js

@@ -466,7 +466,7 @@ var SearchView = View.extend({
      */
     select_completion: function (e, ui) {
         e.preventDefault();
-        if(ui.item.facet.values && ui.item.facet.values.length && String(ui.item.facet.values[0].value).trim() !== "") {
+        if(ui.item.facet && ui.item.facet.values && ui.item.facet.values.length && String(ui.item.facet.values[0].value).trim() !== "") {
             this.query.add(ui.item.facet);
         } else {
             this.query.trigger('add');