[FIX] payment_paypal: no transaction found

The paypal payment flow was crashing because no transaction was found
when the client wasn't connected.

closes odoo/odoo#39408

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

addons/payment_paypal/controllers/main.py

@@ -59,7 +59,7 @@ class PaypalController(http.Controller):
         reference = post.get('item_number')
         tx = None
         if reference:
-            tx = request.env['payment.transaction'].search([('reference', '=', reference)])
+            tx = request.env['payment.transaction'].sudo().search([('reference', '=', reference)])
         paypal_url = tx.acquirer_id.paypal_get_form_action_url()
         pdt_request = bool(post.get('amt'))  # check for specific pdt param
         if pdt_request:
@@ -76,15 +76,15 @@ class PaypalController(http.Controller):
             _logger.info('Paypal: validated data')
             res = request.env['payment.transaction'].sudo().form_feedback(post, 'paypal')
             if not res and tx:
-                tx.sudo()._set_transaction_error('Validation error occured. Please contact your administrator.')
+                tx._set_transaction_error('Validation error occured. Please contact your administrator.')
         elif resp in ['INVALID', 'FAIL']:
             _logger.warning('Paypal: answered INVALID/FAIL on data verification')
             if tx:
-                tx.sudo()._set_transaction_error('Invalid response from Paypal. Please contact your administrator.')
+                tx._set_transaction_error('Invalid response from Paypal. Please contact your administrator.')
         else:
             _logger.warning('Paypal: unrecognized paypal answer, received %s instead of VERIFIED/SUCCESS or INVALID/FAIL (validation: %s)' % (resp, 'PDT' if pdt_request else 'IPN/DPN'))
             if tx:
-                tx.sudo()._set_transaction_error('Unrecognized error from Paypal. Please contact your administrator.')
+                tx._set_transaction_error('Unrecognized error from Paypal. Please contact your administrator.')
         return res
 
     @http.route('/payment/paypal/ipn/', type='http', auth='public', methods=['POST'], csrf=False)