[IMP] web: display no content helper in grouped kanban view

Before this commit, it was not possible to display a help message in a
kanban view, if it is grouped.  This is an issue, from an onboarding
point of view.  Imagine a new user, creating a project.  After it
creates a few columns, it is not clear what to do.

With this commit, we display the nocontent help message in a grouped
kanban view, if the user is not currently creating a new column. This
allows the user to focus on its work, by working in phases: first, he is
prompted to create project column, then when he decides that he is done,
the user interface shows the nocontent help message, which guides
her/him to the process of creating a task.

1 files changed, 5 insertions, 3 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_renderer.js b/addons/web/static/src/js/views/basic/basic_renderer.js
index 83d2da5169a..d9c0f1a570b 100644
--- a/addons/web/static/src/js/views/basic/basic_renderer.js
+++ b/addons/web/static/src/js/views/basic/basic_renderer.js
@@ -559,12 +559,14 @@ var BasicRenderer = AbstractRenderer.extend({
      * message when no content is available.
      *
      * @private
+     * @returns {jQueryElement}
      */
     _renderNoContentHelper: function () {
-        var $msg = $('<div>')
+        var $noContent =
+            $('<div>').html(this.noContentHelp).addClass('o_nocontent_help');
+        return $('<div>')
             .addClass('o_view_nocontent')
-            .html(this.noContentHelp);
-        this.$el.html($msg);
+            .append($noContent);
     },
     /**
      * Actual rendering. Supposed to be overridden by concrete renderers.