ban_appeals.html: do not display the source ip row if there is none

templates/mod/ban_appeals.html

@@ -18,10 +18,12 @@
 				<th>{% trans 'Ban mask' %}</th>
 				<td><a href="/mod.php?/IP/{{ ban.mask }}"</a>{{ ban.mask }}</td>
 			</tr>
+			{% if ban.source_ip %}
 			<tr>
 				<th>{% trans 'Appeal IP' %}</th>
 				<td><a href="/mod.php?/IP/{{ ban.source_ip }}"</a>{{ ban.source_ip }}</td>
 			</tr>
+			{% endif %}
 		{% endif %}
 		<tr>
 			<th>{% trans 'Reason' %}</th>