Add hint for display having no frames defined and change spacing in navbar

Author: ohinckel

config/jinja2/config/base.display.html

@@ -3,7 +3,7 @@
 {% block content %}
 {{ lib.page_header(display.name, display.description, 'display_list', url('display_thumbnail', args=[display.id])) }}
 
-<ul class="nav nav-tabs pt-2">
+<ul class="nav nav-tabs py-2">
   <li class="nav-item">
     <a class="nav-link p-3{{ lib.nav_active(request, 'display_overview', args=[display.id]) }}" href="{{ url('display_overview', args=[display.id]) }}">{{ lib.icon('display.overview') }}<span class="d-none d-lg-inline"> Overview</span></a>
   </li>

config/jinja2/config/display.overview.html

@@ -1,6 +1,10 @@
 {% extends "config/base.display.html" %}
 
 {% block content_display %}
+{% if not display.frame %}
+  {{ lib.note('Currently there is no frame assigned to this display. Create a new frame <a href="%s">here</a>.'|format(url('frame_list'))|safe, 'info') }}
+{% endif %}
+
 <div class="row row-cols-1 row-cols-md-2 row-cols-lg-3">
   {% set stats = display.get_latest_status(60) %}
   {% set latest_items = display.get_latest_items(10) %}