Vue3: Minor fixes in checkinlist editor

src/pretix/static/pretixcontrol/js/ui/checkinrules/App.vue

@@ -75,10 +75,14 @@ const missingItems = computed(() => {
 			li.active(role="presentation")
 				a(href="#rules-edit", role="tab", data-toggle="tab")
 					span.fa.fa-edit
+					// space between icon and string
+					|
 					| {{ gettext("Edit") }}
 			li(role="presentation")
 				a(href="#rules-viz", role="tab", data-toggle="tab")
 					span.fa.fa-eye
+					// space between icon and string
+					|
 					| {{ gettext("Visualize") }}
 
 		//- Tab panes

src/pretix/static/pretixcontrol/js/ui/checkinrules/django-interop.ts

@@ -17,7 +17,7 @@ export const rules = ref<any>({})
 // grab rules from hidden input
 const rulesInput = document.querySelector<HTMLInputElement>('#id_rules')
 if (rulesInput?.value) {
-	rules.value = JSON.parse(rulesInput.value)
+	rules.value = JSON.parse(rulesInput.value) ?? {}
 }
 
 // sync back to hidden input