add error messages in template for additional info

Author: mitchdawson1982

feedback/templates/report_issue.html

@@ -63,6 +63,11 @@ <h1 class="govuk-label-wrapper">
         <div id="more-detail-hint" class="govuk-hint">
           {% translate 'Please provide as much information as possible about the issue.' %}
         </div>
+        {% for error in form.additional_info.errors %}
+          <p id="passport-issued-error" class="govuk-error-message">
+            <span class="govuk-visually-hidden">Error:</span> {{error}}
+          </p>
+        {% endfor %}
         {{ form.additional_info }}
       </div>