Add summary list row condition (#1008)

This wraps all of the the HTML for a summary list row in a condition which checks whether the row object is present.

This allows inline conditions within the Nunjucks macro, which can be handy for prototyping.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Fix Sass deprecation on `mix` function (passing a number without unit) ([PR 995](https://github.com/nhsuk/nhsuk-frontend/pull/995))
 - Add nhsukAttributes macro, copied from GOV.UK ([PR 998](https://github.com/nhsuk/nhsuk-frontend/pull/998))
+- Add support for inline conditions on summary list rows ([PR 1008](https://github.com/nhsuk/nhsuk-frontend/pull/1008))
 - Change "Contact us" in the footer link examples to "Give us feedback" ([PR 972](https://github.com/nhsuk/nhsuk-frontend/pull/972))
 - Adjusted default spacing of back link component ([PR 964](https://github.com/nhsuk/nhsuk-frontend/pull/964))
 - Reduce main wrapper padding on mobile ([PR 1003](https://github.com/nhsuk/nhsuk-frontend/pull/1003))

packages/components/summary-list/template.njk

@@ -10,6 +10,7 @@
 {% endmacro -%}
 <dl class="nhsuk-summary-list {%- if params.classes %} {{ params.classes }}{% endif %}" {{- nhsukAttributes(params.attributes) }}>
   {% for row in params.rows %}
+    {% if row %}
     <div class="nhsuk-summary-list__row">
       <dt class="nhsuk-summary-list__key {%- if row.key.classes %} {{ row.key.classes }}{% endif %}">
         {{ row.key.html | safe if row.key.html else row.key.text }}
@@ -33,5 +34,6 @@
         </dd>
       {% endif %}
     </div>
+    {% endif %}
   {% endfor %}
 </dl>