[simple template] return a default string if there is no description

searx/templates/simple/result_templates/default.html

@@ -6,7 +6,7 @@
 <p class="altlink"> &bull; <a class="btn-collapse collapsed media-loader disabled_if_nojs" data-target="#result-media-{{ index }}" data-btn-text-collapsed="{{ _('show media') }}" data-btn-text-not-collapsed="{{ _('hide media') }}">{{ icon('music-note') }} {{ _('show media') }}</a></p>
 {%- endif %}
 <p class="content">
-  {%- if result.content %}{{ result.content|safe }}{% endif -%}
+  {%- if result.content %}{{ result.content|safe }}{%- else %}{{ _('This site did not provide any description.')|safe }}{% endif -%}
 </p>
 {{- result_sub_footer(result, proxify) -}}
 {% if result.embedded -%}

searx/templates/simple/result_templates/videos.html

@@ -5,7 +5,9 @@
 {% if result.embedded -%}
 <p class="altlink"> &bull; <a class="btn-collapse collapsed media-loader disabled_if_nojs" data-target="#result-video-{{ index }}" data-btn-text-collapsed="{{ _('show video') }}" data-btn-text-not-collapsed="{{ _('hide video') }}">{{ icon('film-outline') }} {{ _('show video') }}</a></p>
 {%- endif %}
-{% if result.content %}<p class="content">{{ result.content|safe }}</p>{% endif %}
+<p class="content">
+   {%- if result.content %}{{ result.content|safe }}{%- else %}{{ _('This site did not provide any description.')|safe }}{% endif -%}
+</p>
 {{- result_sub_footer(result, proxify) -}}
 {% if result.embedded -%}
 <div id="result-video-{{ index }}" class="invisible">