Fixes voucher handling form to not be compulsory

registrasion/forms.py

@@ -61,5 +61,5 @@ class VoucherForm(forms.Form):
     voucher = forms.CharField(
         label="Voucher code",
         help_text="If you have a voucher code, enter it here",
-        required=True,
+        required=False,
     )

registrasion/views.py

@@ -33,7 +33,7 @@ def product_category(request, category_id):
         cat_form.disable_products_for_user(request.user)
         voucher_form = forms.VoucherForm(request.POST, prefix=VOUCHERS_FORM_PREFIX)
 
-        if voucher_form.is_valid():
+        if voucher_form.is_valid() and voucher_form.cleaned_data["voucher"].strip():
             # Apply voucher
             # leave
             voucher = voucher_form.cleaned_data["voucher"]