Update pycroft/model/mpsk_client.py

Co-authored-by: Lukas Juhrich <lukasjuhrich@users.noreply.github.com>

pycroft/model/mpsk_client.py

@@ -38,7 +38,7 @@ def validate_mac(self, _, mac_address):
 
     @validates("name")
     def validate_name(self, _, name):
-        if len(name.replace(" ", "")) == 0:
+        if name.strip():
             raise InvalidName("Name cannot be empty")
 
         return name