Remove placeholder logs of notifications sent

From the:
- dashboard
- activity page

This info will be confusing for users at the hack day, because it will say
they’ve already sent messages when they first sign up.

This involved changing the table macro to have a nice ‘no rows’ message.

app/templates/components/table.html

@@ -23,20 +23,21 @@
 {%- endmacro %}
 
 {% macro list_table(items, caption='', empty_message='', field_headings=[], field_headings_visible=True, caption_visible=True) -%}
-  {% if items %}
-    {% set parent_caller = caller %}
-    {% call mapping_table(caption, field_headings, field_headings_visible, caption_visible) %}
-      {% for item in items %}
-        {% call row() %}
-          {{ parent_caller(item) }}
-        {% endcall %}
-      {% endfor %}
-    {%- endcall %}
-  {% else %}
-    <p class="summary-item-no-content">
+
+  {% set parent_caller = caller %}
+  {% call mapping_table(caption, field_headings, field_headings_visible, caption_visible) %}
+    {% for item in items %}
+      {% call row() %}
+        {{ parent_caller(item) }}
+      {% endcall %}
+    {% endfor %}
+  {%- endcall %}
+  {% if not items %}
+    <p class="table-empty-message">
       {{ empty_message }}
     </p>
   {% endif %}
+
 {%- endmacro %}
 
 {% macro row() -%}