Last bugfixes

app/Models/EventParticipant.php

@@ -141,7 +141,7 @@ class EventParticipant extends InstancedModel
     }
 
     public function getFullName() : string {
-        if ($this->nickname === null) {
+        if ($this->nickname === null || trim($this->nickname) === '') {
             return sprintf('%1$s %2$s', $this->firstname, $this->lastname)
                 |>trim(...);
         }