Require non-empty circle name when creating a new circle

snikket_web/admin.py

@@ -272,6 +272,7 @@ async def edit_invite(id_: str) -> typing.Union[str, quart.Response]:
 class CirclePost(flask_wtf.FlaskForm):  # type:ignore
     name = wtforms.StringField(
         _l("Name"),
+        validators=[wtforms.validators.InputRequired()],
     )
 
     action_create = wtforms.SubmitField(

snikket_web/templates/admin_circles.html

@@ -41,7 +41,7 @@
 {{- create_form.csrf_token -}}
 	<h2 class="form-title">{% trans %}Create circle{% endtrans %}</h2>
 	<div class="f-ebox">
-		{{- create_form.name.label -}}
+		{{- create_form.name.label(class="required") -}}
 		{{- create_form.name -}}
 	</div>
 	<div class="f-bbox">