[FIX] web: possibility to autocomplete 'No' for boolean fields

In the search bar.

Besides, if the label value of the selection field is set to False,
which is quite dummy but accepted
The autocomplete crashed.

addons/web/static/src/js/search.js

@@ -1453,7 +1453,7 @@ instance.web.search.SelectionField = instance.web.search.Field.extend(/** @lends
         var results = _(this.attrs.selection).chain()
             .filter(function (sel) {
                 var value = sel[0], label = sel[1];
-                if (!value) { return false; }
+                if (value === undefined || !label) { return false; }
                 return label.toLowerCase().indexOf(needle.toLowerCase()) !== -1;
             })
             .map(function (sel) {