better error handling in login fn

alkator/urls.py

@@ -17,7 +17,7 @@ Including another URLconf
 from django.contrib import admin
 from django.urls import path
 from alkatorapi.views import (
-    register_racer, register_racer,
+    register_user, register_racer,
     login, logout,
     results, photos,
     payment_result, payment_state,
@@ -27,7 +27,7 @@ from alkatorapi.views import (
 
 urlpatterns = [
     path('admin/', admin.site.urls),
-    path('api/register_user', register_racer),
+    path('api/register_user', register_user),
     path('api/register_racer', register_racer),
     path('api/login', login),
     path('api/login_status', login_status),

alkatorapi/views.py

@@ -6,6 +6,7 @@ from django.contrib.admin.views.decorators import staff_member_required
 from django.contrib.auth.models import User as DjangoUser
 from django.contrib.auth import authenticate, login
 from django.core.mail import send_mail, mail_admins
+from django.utils.datastructures import MultiValueDictKeyError
 from datetime import date, datetime, timedelta
 from urllib.parse import parse_qs
 import requests
@@ -47,7 +48,10 @@ def register_user(request):
 
 @csrf_exempt
 def login(request):
-    user = authenticate(request, username=request.POST['email'], password=request.POST['password'])
+    try:
+        user = authenticate(request, username=request.POST['email'], password=request.POST['password'])
+    except MultiValueDictKeyError:
+        return HttpResponse('{"reason":"Nezadané jméno nebo heslo!"}', status=400, content_type='application/json')
     if user is not None:
         login(request, user)
         return HttpResponse('{"success":"Úspěšně přihlášen uživatel '+ user.email + '"}', content_type='application/json')