Merge pull request #302 from schout-it/7.0

[FIX] undefined links if field is not set

web_tree_many2one_clickable/static/src/js/web_tree_many2one_clickable.js

@@ -26,11 +26,14 @@ openerp.web_tree_many2one_clickable = function(openerp)
             'instance.web_tree_many2one_clickable.Many2OneClickable');
     openerp.web_tree_many2one_clickable.Many2OneClickable = openerp.web.list.Column.extend({
         _format: function (row_data, options)
+        {
+            if (row_data[this.id].value)
             {
                 return _.str.sprintf('<a class="oe_form_uri" data-many2one-clickable-model="%s" data-many2one-clickable-id="%s">%s</a>',
                     this.relation,
                     row_data[this.id].value[0],
                     _.escape(row_data[this.id].value[1] || options.value_if_empty));
+            }
         },
     });