fix a panic and handle cleaning up after a panic

ui/ui.go

@@ -296,6 +296,9 @@ func (l *List) Selected() int {
 }
 
 func (l *List) SelectedID() int {
+	if l.listItems == nil || len(l.listItems) == 0 {
+		return 0
+	}
 	return l.listItems[l.selected].Key
 }