Fixed: Error 500 on password change when old password didn't match.

matemat/webserver/pagelets/admin.py

@@ -10,7 +10,7 @@ from matemat.webserver import pagelet, RequestArguments, PageletResponse, Redire
 from matemat.util.currency_format import parse_chf
 from matemat.db import MatematDatabase
 from matemat.db.primitives import User, ReceiptPreference
-from matemat.exceptions import DatabaseConsistencyError, HttpException
+from matemat.exceptions import AuthenticationError, DatabaseConsistencyError, HttpException
 
 
 @pagelet('/admin')
@@ -101,7 +101,10 @@ def handle_change(args: RequestArguments, user: User, db: MatematDatabase, confi
             if newpass != newpass2:
                 raise ValueError('New passwords don\'t match')
             # Write the new password to the database
-            db.change_password(user, oldpass, newpass)
+            try:
+                db.change_password(user, oldpass, newpass)
+            except AuthenticationError:
+                raise ValueError('Old password doesn\'t match')
 
         # The user requested a touchkey change
         elif change == 'touchkey':