skip empty lines in admins file

imaginaerraum_door_admin/__init__.py

@@ -28,7 +28,7 @@ def create_super_admins(app, user_datastore):
         # afterwards
         admin_data = admin_file.read_text().split('\n')
         for i, line in enumerate(admin_data):
-            if not line.strip().startswith('#'):
+            if len(line.strip()) > 0 and not line.strip().startswith('#'):
                 try:
                     user, email, pw = line.split()
                     validate_email(email)