bitbake: toasterui: empty state for pages

Toaster needs to properly prompt the user and display
actionable help texts when the database is void of
meaningful information. This patch brings in the
"empty" states for pages.

[YOCTO #6755]

(Bitbake rev: 7cfe279bf77b59d5cbd20d8a93e1d33279bebc20)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/templates/project.html

@@ -16,6 +16,19 @@ vim: expandtab tabstop=2
 <script src="{% static "js/ui-bootstrap-tpls-0.11.0.js" %}"></script>
 
 
+{% if lvs_nos == 0 %}
+<div class="alert alert-info">
+			<p>
+			Toaster has no layer information; without layer information, you cannot run builds.<br/> To generate layer information you can:
+			</p>
+			<ul>
+			 <li> <a href="https://wiki.yoctoproject.org/wiki/Setting_up_a_hosted_managed_mode_for_Toaster#LayerSources">Configure a layer source</a>
+			 </li>
+			 <li> <a href="{% url 'importlayer' %}">Import a layer</a>
+			</ul>
+</div>
+
+{%else%}
 <div id="main" role="main" ng-app="project" ng-controller="prjCtrl" class="top-padded">
 
 
@@ -440,4 +453,5 @@ angular.element(document).ready(function() {
   });
 </script>
 
+{% endif %} {# from lvs_nos check #}
 {% endblock %}