catch some error cases.

frontend.py

@@ -27,6 +27,7 @@ def register_post():
     if db.by_email(email):
         return dict(error='Email address already in use.')
     # send confirmation mail
+    try:
         sendmail(
                 email,
                 "[Ticketfrei] Confirm your account",
@@ -37,6 +38,8 @@ def register_post():
                     )
             )
         return dict(info='Confirmation mail sent.')
+    except Exception:
+        return dict(error='Could not send confirmation mail.')
 
 
 @get('/confirm/<token>')
@@ -53,9 +56,13 @@ def confirm(token):
 @view('template/login.tpl')
 def login_post():
     # check login
+    try:
         if db.by_email(request.forms.get('email', '')) \
              .check_password(request.forms.get('pass', '')):
             return redirect('/settings')
+    except AttributeError:
+        pass
+    finally:
         return dict(error='Authentication failed.')