ISTWCMS-6122: ensure that rate of pay for opportunities only displays when there is a value

src/patterns/04-components/card/card-elements/_rate-of-pay.twig

-{% include '@components/label/label.twig' with {
-  'label': 'Rate of pay'
-} %}
-{% if rate_of_pay and rate_of_pay_type %}
-  {{ rate_of_pay }} ({{ rate_of_pay_type[0].title }})
-{% elseif rate_of_pay_type %}
-  {{ rate_of_pay_type }}
-{% else %}
-  {{ rate_of_pay }}
+{% if rate_of_pay %}
+  {% include '@components/label/label.twig' with {
+    'label': 'Rate of pay'
+  } %}
+  {% if rate_of_pay and rate_of_pay_type %}
+    {{ rate_of_pay }} ({{ rate_of_pay_type[0].title }})
+  {% elseif rate_of_pay_type %}
+    {{ rate_of_pay_type }}
+  {% else %}
+    {{ rate_of_pay }}
+  {% endif %}
 {% endif %}