Avoid displaying ".0" decimals on question marks

Fixes #699.

caps/templatetags/caps_templatetags.py

@@ -71,6 +71,22 @@ def percentage(value: float):
     return f"{value * 100:.0f}%"
 
 
+@register.filter
+def format_mark(value):
+    """
+    Display whole-number marks as a whole numbers, and
+    fractional marks as decimals, removing trailing zeroes.
+    """
+    try:
+        value = float(value)
+        if value.is_integer():
+            return f"{int(value)}"
+        else:
+            return f"{value}"
+    except (ValueError, TypeError):
+        return value
+
+
 @register.simple_tag(takes_context=True)
 def council_card(context: dict, slug: str, title="", color: str = "red"):
     """

scoring/templates/scoring/council.html

@@ -296,12 +296,12 @@ <h3 class="exclamation text-white">Visit us again on a bigger screen</h3>
                 </td>
 
                 <td data-column="score" class="score border-bottom">
-                    <span>{{ answer.score }}/{{ answer.max }}</span>
+                    <span>{{ answer.score|format_mark }}/{{ answer.max }}</span>
                 </td>
 
               {% for comparison in answer.comparisons %}
                 <td data-column="score" class="d-none d-md-table-cell score border-bottom">
-                    <span>{{ comparison.score }}/{{ comparison.max }}</span>
+                    <span>{{ comparison.score|format_mark }}/{{ comparison.max }}</span>
                 </td>
               {% endfor %}
 

scoring/templates/scoring/section.html

@@ -320,7 +320,7 @@ <h3 class="fs-5 mb-0 lh-base text-center">{{ council_type.name|title }}</h3>
 
               {% for comparison in question.comparisons %}
                 <td data-column="score" class="text-start text-md-end d-none flex-row d-md-table-cell score">
-                    <span class="me-2">{{ comparison.score }}/{{ question.details.max_score }}</span>
+                    <span class="me-2">{{ comparison.score|format_mark }}/{{ question.details.max_score }}</span>
                     <span class="badge bg-secondary d-md-none">{{ comparison.council_name }}</span>
                 </td>
               {% endfor %}