Make appearance of ‘empty’ table rows even

Our table rows take up 65px vertical space.

We also have things that look like rows that say:
- there are no rows
- there are more rows than can be shown on screen

This commit makes them appear the same height.

app/assets/stylesheets/components/table.scss

@@ -324,11 +324,12 @@
   border-bottom: 1px solid $border-colour;
 }
 
-.table-empty-message {
-  @include core-16;
+.table-empty-message,
+td.table-empty-message {
+  @include core-19;
   color: $secondary-text-colour;
   border-bottom: 1px solid $border-colour;
-  padding: 0.75em 0 0.5625em 0;
+  padding: 20px 0 20px 0;
 }
 
 .table-show-more-link {
@@ -337,7 +338,7 @@
   color: $secondary-text-colour;
   margin-bottom: $gutter * 1.3333;
   border-bottom: 1px solid $border-colour;
-  padding: 10px 0 10px 0;
+  padding: 35px 0 10px 0;
   text-align: center;
 
   .table + & {

app/templates/views/returned-letter-summary.html

@@ -1,4 +1,4 @@
-{% from "components/table.html" import list_table, field %}
+{% from "components/table.html" import list_table, row_heading %}
 {% from "components/message-count-label.html" import message_count_label %}
 {% extends "withnav_template.html" %}
 
@@ -10,7 +10,7 @@
 <h1 class="heading-large">
     Returned letters
   </h1>
-<div class="body-copy-table" id='pill-selected-item'>
+<div class="dashboard-table">
     {% call(item, row_number) list_table(
         data,
         caption="Returned letters report",
@@ -18,8 +18,8 @@
         empty_message='If you have returned letter reports they will be listed here',
         field_headings=['Report'],
         field_headings_visible=False
-      ) %}
-    {% call field() %}
+    ) %}
+    {% call row_heading() %}
       <a class="govuk_link file-list-filename"
          href="{{url_for('.returned_letters', service_id=current_service.id, reported_at=item.reported_at)}}">{{ item.reported_at | format_date_normal }}</a>
        <p class="file-list-hint">

tests/app/main/views/test_returned_letters.py

@@ -19,12 +19,12 @@ def test_returned_letter_summary(
 
     assert page.h1.string.strip() == 'Returned letters'
     assert normalize_spaces(
-        page.select_one('.table-field-left-aligned').text
+        page.select_one('.table-field').text
     ) == (
         '24 December 2019 '
         '30 letters'
     )
-    assert page.select_one('.table-field-left-aligned a')['href'] == url_for(
+    assert page.select_one('.table-field a')['href'] == url_for(
         '.returned_letters',
         service_id=SERVICE_ONE_ID,
         reported_at='2019-12-24',
@@ -45,7 +45,7 @@ def test_returned_letter_summary_with_one_letter(
 
     assert page.h1.string.strip() == 'Returned letters'
     assert normalize_spaces(
-        page.select_one('.table-field-left-aligned').text
+        page.select_one('.table-field').text
     ) == (
         '24 December 2019 '
         '1 letter'