OO-1822: beautify the tag input

src/main/java/org/olat/course/nodes/members/_content/individual_members.html

@@ -3,6 +3,6 @@
 	#foreach ($member in $selectedMembers)
 		<span class="tag label label-info">$member.fullName $r.render(${member.getRemoveComponentName()})</span> 
 	#end
-	</span>
+	&nbsp;</span>
 	<span class="input-group-addon">$r.render("add.member")</span>
 </div>
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