fix error when list of extra users is empty

pilab/events/reservation.py

@@ -285,7 +285,10 @@ def get_active_users(cube_id: int):
         raise RuntimeError("Reservation consumer is not initialized")
 
     if res and res.endtime > datetime.utcnow().replace(tzinfo=ZoneInfo('UTC')):
-        return [*res.extraUsers, res.owner]
+        if res.extraUsers is None:
+            return [res.owner]
+        else:
+            return [*res.extraUsers, res.owner]
     else:
         return []
 

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 
 setup(
     name='pilab',
-    version='1.5.7',
+    version='1.5.8',
     description='Shared-Libs for the pi-lab microservices',
     url='https://code.fbi.h-da.de/api/v4/projects/27896/packages/pypi/pilab',
     author='Max Reinheimer',